Trig can be a beast but it's pretty once you get the hang of it. I have a few questions. 

Hey I'm taking Trig but don't always understand it. I don't have a specific question today but does anyone have some good study methods for math? I have always been weak in math so if there are any ideas you have to up my skill please post them. 

Trig can be a beast but it's pretty once you get the hang of it. I have a few questions. 

Previously PhilosopherStoned
If you're working mostly on a computer, I suggest you always have pen and paper ready, so you can make quick sketches of whatever you're working with. It is infinitely easier than any solution you have on your PC, and it helps you a ton to have a drawing to look at, if something doesn't make sense inside your head. 


Lost count of how many lucid dreams I've had

The reason you suck at math is that you want to memorize the functions. Understand how it works from the ground up, and you will never have to memorize a thing. If you can draw a right triangle with angles A, B, C and edge lengths a, b, c, and if you can express "sin(A)" or "cos(B)" in terms of a, b or c, then you can easily solve just about any problem, and derive just about any trig inequality. 

Thanks everyone. I don't know complex numbers yet. I'll do what you said Replicon. 

With math in general I find the following important: 

Last edited by Dianeva; 03202011 at 10:39 PM.
Thanks so much Dianeva wolframalpha makes my life way easier. 

Replicon is totally right. The way to learn maths is to understand it, which is also the case with most of science. This has many advantages: firstly, you can pretty much never forget something if you understand why it is true. Secondly, you will be a lot more confident with applying your knowledge, especially to novel situations. Thirdly, it's a lot easier to learn more stuff which builds on this knowledge, and the thing about maths is that new stuff always builds on what came before. 

Xei, do you happen to know a good way to derive the formulas for e.g., cos(a + b), that doesn't use e^{i(a + b)} or rotation matrices? Those are the only two I know and it would be good to know one that doesn't require complex multiplication or matrix multiplication. 

Previously PhilosopherStoned
Thank you all so much for helping me 

Yes; I know a geometrical argument for sin(A+B) which is the simplest one. All variations you can then get using cos(x) = sin(pi/2  x), sin(x) = sin(x), and cos(x) = cos(x). 

I don't understand your construction. How can the bottom triangle's adjacent horizontal be the same as its hypotenuse? I'm also not sure which leg is the adjacent horizontal and which is the adjacent. I've seen them referred to as the adjacent and the opposite with respect to an angle. In this case a or b. 

Previously PhilosopherStoned
It's the top triangle's adjacent which is the same as the bottom triangle's hypotenuse. 

I suck at trig but one thing you should know is soh cah toa 

"For a long time it gave me nightmares, having to witness an injustice like that. It was a constant reminder of how unfair this world can be, I can still hear them taunting him. 'Silly Rabbit, Trix are for kids!'... How come they just couldn't give him some cereal?"
PM me your trig questions... I'll destroy them 

Get some programs for your calculator to do it for you. (Google it) 

Lucid Dreams: 3
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