$\tan$ function at $\pi/2$
63943
Is $\tan(\pi/2)$ undefined or infinity?
153867
Evaluate $ \int_{0}^{\frac{\pi}2}\frac1{(1+x^2)(1+\tan x)}\:\mathrm dx$
150843
Evaluation of $\int_0^{\pi/4} \sqrt{\tan x} \sqrt{1-\tan x}\,\,dx$
96414
Using residues to evaluate the integral $\int_{-\pi}^{\pi} \frac{\cos(n\theta)}{1-2a\cos(\theta)+a^2}d\theta$, $|a|<1$
11059
Verify the identity: $\tan^{-1} x +\tan^{-1} (1/x) = \pi /2$
105177
Gosper's unusual formula connecting $e$ and $\pi$
17925
Vardi's Integral: $\int_{\pi/4}^{\pi/2} \ln (\ln(\tan x))dx $
68550
What is the radius of convergence of the Taylor series of $\frac{2\tan x}{1+4x^2}$ around $x=0?$
122395
Integrating $\sec\theta\tan^2\theta d\,\theta$
28890
Why does the tangent of numbers very close to $\frac{\pi}{2}$ resemble the number of degrees in a radian?
45092
Integrating a function of tan inverse
112314
On The Range Of The Tangent
109790
Finding the value of $\int_0^{\pi/2} \frac{dt}{1+(\tan(x))^{\sqrt{2}}}$
111601
Evaluating $\int \tan^{1/3}(\theta) d \theta$
1331
Approximation of the Sine function near $0$
88097
Fourier series for $f(x)=(\pi -x)/2$
36701
$\displaystyle\int_{0}^{2\pi}\frac{1}{a+ \cos\theta}\,d\theta$