$\int\frac{1}{x\sqrt{x^4+x^2+1}}dx$
124677
Substitution needed for calculating an integral
123500
Integration of $\frac {1}{1+\sin x}$
6830
Find $\int\frac1x\sqrt\frac{1-x}{1+x}\ dx$
102156
Integral of $\int_0^{\pi/2} \frac {\sqrt{\sin x}}{\sqrt {\sin x} + \sqrt {\cos x}}$dx
26096
Evaluating $\int \frac{\sin{x}+\cos{x}}{\sin^4{x}+\cos^4{x}} \mathrm dx$
146338
How to evaluate $\int\frac{1+x^4}{(1-x^4)^{3/2}}dx$?
82408
Integral $\int_{1}^{2011} \frac{\sqrt{x}}{\sqrt{2012 - x} + \sqrt{x}}dx$
104691
Integration of $\int_{0}^{1} \frac{x^k}{1-x} dx$
46706
Integral $\int_0^2 \frac{\arctan x}{x^2+2x+2}dx$
130935
Evaluating $\int_{0}^{1}\frac{x-1}{(x+1)\ln x} dx $
144039
Computing $ \int_0^{\infty} \frac{ \sqrt [3] {x+1}-\sqrt [3] {x}}{\sqrt{x}} \mathrm dx$
132383
Evaluate the integral $\int_{-1}^1\frac{dx}{(e^x+1)(x^2+1)}$.
40310
How to integrate $\frac{1}{\sqrt{1+x^2}}$ using substitution?
47452
Calculus Question: $\int_0^1\frac{(x-x^2)^4}{1+x^2}dx$
104583
Simplify $\int \frac{1}{\sqrt{2-x^2}}\, dx$
88815
Integral of $\int \frac{dx}{\sqrt{x^2 -9}}$
99584
Evaluation of $\int \frac{\sqrt{\sin ^4x+\cos ^4x}}{\sin ^3x \cos x }dx$