Transform $\frac{-2}{\tan\frac{x}{2}+1}$ to $\tan x-\sec x$?
123500
Integration of $\frac {1}{1+\sin x}$
40534
What is $(-1)^{\frac{2}{3}}$?
118456
Find $\sum_{n=1}^{\infty}\tan^{-1}\frac{2}{n^2}$
13789
solve $T(n)=T(n-1)+T(\frac{n}{2})+n$
7296
Prove $(1-\cos x)/\sin x = \tan x/2$
95403
Evaluating $\int \frac{\sec^2 x}{(\sec x + \tan x )^{{9}/{2}}}\,\mathrm dx$
140342
$\frac {1}{5}-\frac{1.4}{5.10}+\frac{1.4.7}{5.10.15}-\cdot\cdot\cdot\cdot\cdot\cdot\cdot$
149376
How to Find $ \lim\limits_{x\to 0} \left(\frac {\tan x }{x} \right)^{\frac{1}{x^2}}$.
122395
Integrating $\sec\theta\tan^2\theta d\,\theta$
145632
Proving $\frac{1}{\cos^2\alpha}<\frac{\tan\beta-\tan\alpha}{\beta-\alpha}<\frac{1}{\cos^2\beta}$
113045
How do I find the inverse of $f(x) = \frac{x}{x^2 + 1}$
136409
Verify $\int\sec x\ dx=\frac12 \ln \left\lvert\frac{1+\sin x}{1-\sin x}\right\rvert + C$
61443
So close yet so far Finding $\int \frac {\sec x \tan x}{3x+5} dx$
47206
$-1 = 0$ by integration by parts of $\tan(x)$
97326
Find $\lim_{x \to 0} (\frac{\tan(x)}{x})^{\frac{1}{x}}$
81337
How to solve $(1-\tan^2x)\sec^2x+2^{\tan^2x}=0$
52413
Show that $\tan{(\pi/7)} \tan{(2\pi/7)}\tan{(3\pi/7)}=\sqrt{7}$