tell me everything I need to know about trigonometry

>>8758804
sen^2x+cos^2x=1

>>8758804
cosx+sinx=sqrt2

>>8758817
My high school math teacher called it the idiot equation, because even an idiot could remember it.

>>8758804
soh cah toa

e^aix = cos(ax) + isin(ax) can prove and derive all your puny formulas

>>8758832
Easily shown to be wrong by plugging in x=0

>>8758874
explain what each thing means

>>8758876
cute
now try pi/4

>>8758877
e = euler's number
a = a constant
i = imaginary number
x = variable

>>8758874
what's the point of the constant, brainlet ?

With these definitions you can do trigonometry with exponentials.
[math]\cos(x)=\frac{e^{ix}+e^{-ix}}{2}[/math]
[math]\sin(x)=\frac{e^{ix}-e^{-ix}}{2i}[/math]

>versin
>exsec
>excsc
>cvs
>crd
I need a quick rundown on these

>>8759076
Outdated memes.

>>8758877
>>8758998

Euler's number is the limit of continuously compounding interest:

[math]e = \lim_{n \rightarrow \infty} (1 + \frac{1}{n})^n[/math]