How can I find $\int \frac{1}{\sqrt{x^2 + x + 1}} dx$
45872
Integration: $\int\frac{1}{(x^2+x+1)^{1/2}} dx$
63016
Integration of $\int\frac{1}{x^{4}+1}\mathrm dx$
143734
Evaluating $\int \frac{\sin\left(x\right)}{1+x^2}dx$
61740
Evaluate the integration : $\int\sqrt{\frac{(1-\sin x)(2-\sin x)}{(1+\sin x)(2+\sin x)}}dx$
112621
Finding $\int_{0}^{\infty} \frac{e^{3x}-e^x}{x(e^{3x}+1)(e^x+1)} dx$
113045
How do I find the inverse of $f(x) = \frac{x}{x^2 + 1}$
104583
Simplify $\int \frac{1}{\sqrt{2-x^2}}\, dx$
42992
How do I integrate the following? $\int{\frac{(1+x^{2})\mathrm dx}{(1-x^{2})\sqrt{1+x^{4}}}}$
105260
How to integrate $\int\sqrt{x^2+1}dx$
31227
Find the indefinite integral $\int {dx \over {(1+x^2) \sqrt{1-x^2}}} $
140203
Find the value of $\int_{-\infty}^{\infty} \frac{e^{-x^2}}{1+x^2} dx$ .
39629
Indefinite integration of $\int \frac{1}{1+\sqrt{x^2+2x+2}}dx$
125069
Help with $\int \frac 1{\sqrt{a^2 - x^2}} \mathrm dx$
67608
Integration of $1/(x^2+x\sqrt{x})$
154491
Evaluate $\int \frac{\sqrt{x^2-1}}{x} \mathrm{d}x$
116219
How can I find  $\int\frac1{\sqrt[4]{1+x^4}}\mathrm dx$?
82408
Integral $\int_{1}^{2011} \frac{\sqrt{x}}{\sqrt{2012 - x} + \sqrt{x}}dx$