
calc III polar integral
I need help with the following question.
"Change into an equivalent polar integral, then evaluate the polar integral."
Given: [4 to 0][0 to (4xx^2)^.5] 2x+3y/x^2+y^2 dxdy
I changed the equation to 2rcos(theta)+3rsin(theta)/r^2 r dr d(theta)
... reduces to 2cos(theta) + 3sin(theta) dr d(theta)
My limits came out to [pi to 4pi/3] and [0 to 2/cos(theta)]
I am really having a problem trying to understand what to change the limits to and why.
Any help would be very much appreciated.