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Homework Statement
Solve for indefinite integral of
(7x^3)/sqr(4+x^2)(dx)
Homework Equations
I just can't seem to find the right solution.
The Attempt at a Solution
First of all, we can just factor the 7 out of the integral for now since it is only a constant.
the inverse square root of (4+x^2) looks like arctan(x/2).
So I set 1/(4+x^2) up as dv, and so V would equal arctan(x/2). U is then x^3, and du is 3x^2.
However, the integrals just don't seem to simplify. Please help.