Well its day 0 now since you technically used them in this meme even if it was only the words
Smartass!
So you’re saying the real reason we learn about trigonometry is so we can talk about how pointless and shit it was to learn
So when I type the word “sink” I’ve used the sin() function?
Yeah you are. You can’t use electricity without it.
This is a DC only household
Shut up Thomas, Nikola won!
From the first sentence:
[…] uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems.
So, actually actually. ;)
How do you run your appliances?
I don’t, I’m actually Amish. I’m writing to you from a steam powered thinking machine
TIL I’m an HTML developer because I’m surfing on the internet
The meme said they didn’t use it not that they didn’t apply it.
Nah, I hired an electrician to handle all that for me. Now if I want electricity all I have to do is stick a plug in a socket, or flip a switch. It’s way more convenient.
If the power into your house is off from 60Hz (or 50 depending on your region), an electrician isn’t going to do diddly.
Neither am I cause I don’t know what that means.
How could it be off frequecy at house level? Aren’t the generators at the powerplants being spun at 50 or 60 times a second?
Not exactly. There’s a ratio of RPMs of the drive motor to the specific input of the alternator that generates the correct frequency. It depends on the way the alternator is designed (ie number of poles) that will yield the correct frequency, almost like a gear ratio, that is optimized for efficiency, and power plants have to constantly make slight adjustments to the drive motor speed the keep the frequency exact (usually done automatically within the drive control system).
I’ve never seen frequency be an issue in a residential system, but in theory it could happen.
It used to be common for clocks to be driven directly off the electrical frequency. The US Navel Observatory would call up generator plants and tell them to slow down or speed up a little to make a correction to all the clocks. I’m not sure if that still happens, though.
I don’t know how it’s in 60Hz regions, but here the generators are in 3 phases, 120 degrees apart. The voltage gets transformed to up to 400kV, still in 3 phases, and then down to 400V when it’s distributed to peoples’ homes. Then you can pull 400V 3-phase or 230V 1-phase from your wall.
It’s the same here, though we have varying degrees of transmission and distribution voltages via transformers and regulators. In my area, power comes into our valley from the 500kv lines through the open desert, into the valley at 33kv, and stepped down to 5kv for neighborhood distribution that the single phase 240/120v transformers tap off for the EOL.
More of what I was getting at was that generation is more or less the same across regions. Some external fuel source (whether it’s diesel, natural gas, nuclear, steam, etc) does its thing to drive a rotor that’s connected into an alternator which is essentially an electric motor but instead of the electric motor doing the driving, it’s being driven which generates power, and the RPMs of whatever given fueled drive mechanism are not necessarily 1:1 with the alternator speed.
if you were a more interesting person you could make up a use for them
Best take right here. Trig shows up a lot when you actually do stuff. Woodworking, programming, physics, art, music, philosophy. Math shit is universal human language.
Math shit is universal
humanlanguageMath shit is universal
humanlanguage. True.But the language part of it is pretty human.
I like doing stuff but my adhd literally won’t let me learn trig 🤣 my brain will just shut down and start daydreaming of literally anything else.
Don’t tell yourself that, unless you’re just not that interested. It takes more work and catering some creative solutions, but it is worth it. I got an engineering degree before I was ever even diagnosed or medicated.
I’m totally not interested in math stuff, like at all. If I need it for what I’m trying to do, or if it greatly helps me with it, I still end up learning it anyways though :) People often say that learning in practice is the best way and I feel like that is even much more true for me personally. I’m goal oriented af, and I make all those goals myself based on what I want to do. If I really really really want to do something, there’s nothing that will stand in my way, I’ll find a way. I’m the type of person to get frustrated and say “fuck this I give up”, only to be back at it after 30 mins because giving up isn’t actually something that exists in my head haha.
So no need to worry about me telling myself that. I guess I was thinking from the perspective of just studying it because of studying it, which yeah is basically impossible for me unless it’s just something I’m really interested in and I’m stuck browsing Wikipedia at 3AM. Thanks for the encouragement though, nice stranger! I really do appreciate it.
The other fields I get (trig is insanely useful), but how the bloody hell does one use trig functions in philosophy? Are we gonna be triangulating the border of science to solve the demarcation problem?
Math is philosophy, and trig does a very good job of describing the world we experience. The unit circle, right angles, pythagorean theorem, sinusoidal damping, etc, are all pretty philosophical concepts. What else could the be.
Honestly. If you’ve ever played a videogame, it will inevitably require trig.
The only function is sine, the rest are just remixes and ratios
Or cos if your weird
Or some say Kosm.
man I was talking about bloodborne today at work and I miss that game, might be time for a replay. Sucks that its 30fps tho
Sin(x+π/2)
You may have used them indirectly in the compression of your image
Fair enough, but did they use it? I always felt like focusing on statistics instead of random trig stuff for non stem people people would be more useful
Sticking with image compression, see Quite Okay Images. It treats each pixel as three numbers and expects mostly small changes. Recent pixels get hashed and can be referenced in a few bits. This is enough to compete with PNG filesizes, an order of magnitude faster, while handling each pixel exactly once.
though note than lossy formats , like JPEG which was used here , do use Fourier transforms , which are very intense trigonometry . IIRC PNG doesn’t use trigonometry either ,
though I’m not entirely sureyup PNG uses DEFLATE after some filtering , so no sine there I believe
Agreed, I use highschool level stats knowledge on a nearly daily basis, whereas the last time I did any trig was to follow along with a math video I was watching on YouTube. Trig/calc were mandatory, stats was not.
JPEG uses a lossy form of compression based on the discrete cosine transform (DCT).
Many modern compression schemes are more about signal processing than statistics , especially the lossy ones . IIRC 3blue1brown has a video on image compression if you want to learn about it in a visual way
Alternatively, you could be this guy.
I aspire to be this man when I am that old.
Woah. I was really expecting the “will we ever use this in life”/“you won’t but some of the smarter kids might” strip, which is also SMBC.
Me, whose going to start studying EE: 😭
HAHAHAHA GOOD LUCK! I’m in my final year of my EE study and I cannot wait to escape this mental asylum
Electrical Engineers are the psychos for using j instead of i. Absolutely bonkers.
Yeah, I agree. They messed up the scheme we had going. It was a good thing, and electrical engineers had to come and be all different, confusing everyone else along the way.
From my point of view the mathematicians are evil. I can’t stand them using i in my math classes, messing my whole scheme up. Respect for my physics prof in my first semester for switching to use the correct letter j
From my point of view the mathematicians are evil.
Well, then you are lost!
That’s a bit much dude, mathematicians gave us complex numbers. You can’t hate too much on the ones who invented our jobs 🤣
There is hope for you after the asylum. My daughter has an EE degree. While in school, she would call me every October and tell me how terrible it was and that she wanted to drop out. I would talk her off the ledge, and she got through.
Now she’s working, making more money than I do in her early twenties, and she loves loves loves her job.
Keep going!
Luckily I have 6 years of Electronics manufacturing experience, so the math and theory are the things I’ll need to learn most of. Unfortunately, those things are the hardest part…
Don’t worry.
Trig is not hard ☺️
Compared to what you’re also gonna learn 🤣
Signed, An EE graduate from 2016, who now works in embedded fixed point signal processing 😵
One day, while working on a website, I was wondering how to calculate a specific point in a graph. After googling, the answer was by using sine and cosine. Mind blew away, I had always thought I’d never use them.
And guess what? You found it out without having to memorize the process until you knew it by heart.
Apparently, they didn’t know it by heart. If they had, they wouldn’t have had to spend all that time searching.
The point being that memorizing complex math is pointless unless you’re using it for some sort of day to day.
Complex? It’s just Sohcahtoa my friend
I thought this was early high-school level stuff.
Since becoming an adult it has become increasingly obvious to me that early high-school level stuff is impossibly complex for a significant chunk of the population.
It’s unfortunate that you are correct. However, when it comes to memorization, trig seems pretty tame. That one mnemonic just about covers it all. Even multiplication tables seem like a larger memorization effort to me.
Instructions unclear. Toe is still dry, dick stuck in super soaker.
Not really. The point of getting really good at it in your teenage years is so that when it shows up 30 years later you have a vauge idea of what you’re looking at and can figure it out again. If you had only a surface level understanding to begin with, it’ll all be totally gone by the time you need it again, and very few people have the gumption to teach themselves a subject from scratch.
The reason they drill it in to the extent that they do is so that you have a foundational understanding of the underlying math on which to build new knowledge. If you show up in calc 1 in college without remembering even the basic concepts you were previously taught in things like trig…that can really bite you in the ass. My teacher LOVED pulling out classic substitutions for Secant, Cosecant, and cotangent (No, i didnt outright remember them from Trig, but I had seen them, and that made refreshing much easier). Also these concepts then form the basis of many other fields such as physics (electricity/magnetism, kinetic motion, optics, etc.), chemistry (quantum, MO theory, and things relating to the physics side of why chemistry occurs), and many of the graphing concepts used in engineering/stem only make sense if you have the foundational understanding of what integration/derivation are. Those stem from understanding how to graph complex functions by hand (like we did in trig) so that when you are doing it later with assistance, you still GRASP what is going on.
Yes its not perfect, and yes for people who never need that later in life it can suck. However, I would make the argument it is better to have more of your population educated to a higher standard than what is needed in daily life, than to only give that to those who are aware enough at a young age to actively seek said education
Personally once you got to the Cos Sin Tan and Log part of math in grade 11 and 12 no amount of practice ever improved my understanding of the underlying principles. Once most of the work gets done in the calculator or computer I just lost sense of what was happening in the background. It’s just turned into put number in calculator and get answer. But that’s probably just a failing of the local school systems methods or the individual teachers maybe.
There will be those that do and dont get the “nitty gritty” of the theory side of the math. Those people sometimes become math majors. Normal people (joking, dont be mad math majors), need more than simply the theory side of the math and actually need to see/perform the application side of things. I never once “understood” the lesson in math class when we go over the equations with variables only. I only truly began to learn the material and be able to use it once we got to the example problems. We would do multiple in class and then I would understand how to literally go through the problem and perform the math that was expected of me on the homework, and subsequently the test. There is tons of stuff i know how to use in math, but by no means understand WHY it came to be, or HOW its works for the realm of mathematics. I wanna know how this math can help me solve real life problems, problems I will face in industry, or even just a cool way to apply math in the real world. Not how it will be used in research to find new types of math we wont be able to apply for 70 years.
It was pretty funny being in calculus in college. I was in a class with mostly engineers who were also taking the exact same weed out courses, and nearly every day after the professor would finish showing us the theory side of the lesson, hands would shoot up and the question of, “What application does this have in real life or engineering? Like, how will I actually use this?” always got asked. So not “loving” the theory is by no means uncommon (we all wished for an application focused version of the class to exist, for people like stem students who are not into the math theory lol), but I still see the value in having it presented so that you can have a more foundational understanding instead simply going through the motions
Me working on graphics and audio programming all day.
Trigonometry is extremely useful when constructing things. Need to know the length of wood needed to go from corner to corner. That’s trig my friend.
Go on…
A^2 + B^2 = C^2 is known as the Pythagorean theorem. This theorem explains the proportionality of the 3 sides of a right triangle (a triangle with 1 corner angle = 90 degrees). If you know the length of 2 sides (in his example, the wall beams) you can find out the length of the third (in his example, this would be the supporting strut spanning the beams that meet at a 90 degree angle). If their example is explaining a beam that spans the room from 1 corner to the other, you still use this formula as a rectangle is 2 right triangles that meet along their hypotenuse (the longest leg of a right triangle, or the length you are solving for in this problem). The 2 known sides are the length/width of the room, and you solve for the 3rd side, your diagonal beam
Did Pythagoras even know about sin, cos and tan? I am reluctant to call A^2 +B^2 =C^2 trigonometry.
Hipparchus, the alleged founder of trigonometry, was alive 350 years after Pythagoras (500BC to 150BC).
Completely fair point, that I do not think I have the knowledge to speak on. On the Trigonometry Wikipedia page, he pops up a few times, and many trig identities are known as pythagorean identities. Perhaps its not fully trig, but was used as a basis to help discover trig? Without having the understanding pythagorus gave mathematicians regarding triangles, I would think it would be pretty hard to begin developing deeper math regarding said triangles
When you’re in school you think calculus is the fucking shit, but in the real world you actually use trig way more often.
Oh I am sinning like a motherfucker
[TRIGONOMETRY WARNING]
I see you have never built a chicken coop.
I use trig every few years when buying a tv. Tv specs always list diagonal but rarely horizontal and vertical which is needed for knowing how a TV will fit in a space.
I mean unless you’re able to do it in your head in less than a minute, bringing a tape measure would probably be faster and easier.
