1. The problem statement, all variables and given/known data Change the Cartesian integral into an equivalent polar integral and then evaluate. 2. Relevant equations x=rcosθ y=rsinθ I have: ∫∫r2cosθ dr dθ The bounds for theta would be from π/4 to π/2, but what would the bounds for r be? I only need help figuring out the bounds, not with the evaluating. The answer for the problem is 36 (or so says the back of the textbook).