Solve identity: $\frac {\sin x}{1-\cos x} = \frac {1+\cos x}{\sin x}$
111102
Prove the Trigonometric Identity: $\frac{\sin x}{1-\cos x} = \frac{1+\cos x}{\sin x}$
82170
Solve $x = \frac{1}{2}\tan(x)$
56059
If $\frac{\sin^4 x}{a}+\frac{\cos^4 x}{b}=\frac{1}{a+b}$, then show that $\frac{\sin^6 x}{a^2}+\frac{\cos^6 x}{b^2}=\frac{1}{(a+b)^2}$
143050
If $\tan(\frac{\pi}{4}+\frac{y}{2})=\tan^3(\frac{\pi}{4}+\frac{x}{2})$,then prove that $\sin y=\frac{\sin x(3+\sin^2 x)}{(1+3\sin^2 x)}$
149447
Proving $\sin (x)=\cos (90^\circ-x)$
157264
Solve $\frac1x+\frac1y=\frac1{pq}$
24656
Proving that $\frac{\csc\theta}{\cot\theta}-\frac{\cot\theta}{\csc\theta}=\tan\theta\sin\theta$
53438
I need assistance in integrating $ \frac{x \sin x}{1+(\cos x)^2}$
154216
Solve $\sin(z) = z$ in complex numbers
37108
Solve $\cos(z)=\frac 34+\frac i4$
85944
Prove $ \sin x + \frac{ \sin3x }{3} + ... + \frac{ \sin((2n-1)x) }{2n-1} >0 $
17769
Show that $\frac{\sin x}{\cos 3x}+\frac{\sin 3x}{\cos 9x}+\frac{\sin 9x}{\cos 27x} = \frac{1}{2}\left(\tan 27x-\tan x\right)$
6830
Find $\int\frac1x\sqrt\frac{1-x}{1+x}\ dx$
33396
Generalizing a Trig Identity
31852
An elegant way to solve $\frac {\sqrt3 - 1}{\sin x} + \frac {\sqrt3 + 1}{\cos x} = 4\sqrt2 $
39461
What is the solution of $\cos(x)=x$?
60230
Prove that $\frac{1+\sin\theta+i\cos\theta}{1+\sin\theta-i\cos\theta}=\sin\theta+i\cos\theta$