1. The problem statement, all variables and given/known data How would you find the anti derivative of (1+x^2)^(1/2) I am trying to find the definite integral of that function from 0 to 1 2. Relevant equations 3. The attempt at a solution Here is what I tried so far: I let u=1+x^2 du=2xdx solving for dx, dx=(1/2x)du I plug dx into the integral to get (integral sign)(1/(2x))(u)^(1/2)du So after I solve this I get [(1+x^2)^(3/2)]/(3x) from 0 to 1. But obviously this is wrong because if I plug 0 in for x, the function does not exist!