# Math Help - Integral problem-

1. ## Integral problem-

I saw a guys signature with this integral-

Intgral of cos(x)/(1+x^2)^2

find it from infinity to negative infinity =]

the answer was pi/e im curious on finding the indefinte integral xD

2. Originally Posted by Khonics89
I saw a guys signature with this integral-

Intgral of cos(x)/(1+x^2)^2

find it from infinity to negative infinity =]

the answer was pi/e im curious on finding the indefinte integral xD
The indefinite integral cannot be found using a finite number of elementary functions. This might seem strange to you since obviously the quoted definite integral can be found. Even then, the quoted integral is an example of only a small set of definite integrals for this integrand whose exact value can be found.