Does anyone know how to do these problems. I'm stuck on them, and I don't know where to start. Thanks for any help.

1. the integral from 0 to 1 of (theta + 1)/ the square root of ( theta^2 + 2 theta)

2. the integral from 0 to infinty of (16tangent inverse of x)/(1 + x^2) dx

3. the integral from negative infinty to infinity of 2xe^(-xsquared) dx