Verify $\arccos{x}+\arcsin{x}=\frac{\pi}{2}$
33791
Is it generally true that $\arcsin \theta + \arccos \theta = \frac{\pi}{2}$?
69803
An elementary proof of $\int_{0}^{1}\frac{\arctan x}{\sqrt{x(1-x^2)}}\,dx = \frac{1}{32}\sqrt{2\pi}\,\Gamma\left(\tfrac{1}{4}\right)^2$
83359
Complex number identity by trigonometry
123136
Proof of the identity: $c\sin \frac{A-B}{2} \equiv (a-b) \cos \frac{C}{2}$
57750
Solve identity: $\frac {\sin x}{1-\cos x} = \frac {1+\cos x}{\sin x}$
18473
Proof for the formula of sum of arcsine functions $ \arcsin x + \arcsin y $
46353
Proof that $\cos(\pi/3)=1/2$
147410
ArcTan(2) a rational multiple of $\pi$?
140507
Integrating $\frac{\arctan x}{x\sqrt{\smash[b]{1-x^2}}}$
127284
Closed form of $\int_0^{\pi/2} \frac{\arctan^2 (\sin^2 \theta)}{\sin^2 \theta}\,d\theta$
136287
Separate real and imaginary part of $\arccos(z)$
13747
Proof of $\int_0^\infty \frac{\sin x}{\sqrt{x}}dx=\sqrt{\frac{\pi}{2}}$
142835
Proving :$\arctan(1)+\arctan(2)+ \arctan(3)=\pi$
25032
How to calculate $\theta = \arcsin\left(\frac{1}{2}\right)$ with given four function calculator?
44438
Prove : $\frac{\cos(x_1) +\cos(x_2) +\cdots+\cos(x_{10})}{\sin(x_1) +\sin(x_2) +\cdots+\sin(x_{10})} \ge 3$
24311
Proving $\frac{\sin x}{x} =\left(1-\frac{x^2}{\pi^2}\right)\left(1-\frac{x^2}{2^2\pi^2}\right) \left(1-\frac{x^2}{3^2\pi^2}\right)\cdots$
1859
Proving $\arctan(\sqrt{x^2+1}-x)=\frac{\pi}{4}-\frac{1}{2}\arctan(x)$