Ostrogradsky method, integral of 1/(1+x^2)^2
10:54
Integral of x^i
24:56
Integrate 1/(1+x^3)
11:39
integral of x^2/(xsin(x)+cos(x))^2
12:24
A crazy yet perfect integral
25:46
integral of sqrt of tanx
10:51
A Putnam Exam Integral from 1980
22:44
integral of sin(x)/x from 0 to inf by Feynman's Technique
13:50