Is $\sin^2+\cos^2-1=0$ the only relation for $\sin$ and $\cos$?
73445
Is Pythagoras the only relation to hold between $\cos$ and $\sin$?
7296
Prove $(1-\cos x)/\sin x = \tan x/2$
17188
Simplify $\cos(n \pi)$ and $\sin(n \pi)$ when n is an integer
96328
Proving $e^{i\pi} = -1$ without proving $e^{ix} = \cos x + i\sin x$
26486
How to find all the solutions to cos$(z)=0$
89319
How can I find all the solutions of $\sin^5x+\cos^3x=1$
81102
Cosine of the sum of two solutions of trigonometric equation $a\cos \theta + b\sin \theta = c$
117587
$\int_{0}^{1}\frac{\sin^{-1}\sqrt x}{x^2-x+1}dx$
97213
Why does $\sin(0)$ exist?
131688
Solve $\sin 7x+\sin 3x=0$
96367
Intuition of Addition Formula for Sine and Cosine
75487
How to express trigonometric equation in terms of of given trigonometric function?
60230
Prove that $\frac{1+\sin\theta+i\cos\theta}{1+\sin\theta-i\cos\theta}=\sin\theta+i\cos\theta$
40235
How would I differentiate $\sin{x}^{\cos{x}}?$
66872
Exact values of $\cos(2\pi/7)$ and $\sin(2\pi/7)$
73538
solving $\cos z + \sin z = i$
27628
Solving $a \sin\theta + b \cos\theta = c$