Evaluate the given integral by changing to polar coordinates. x² - y² dA, where D is the region bounded by the semicircle x = V64 - y2 and the y-axis (1-e 81 )x 2.

(3) Evaluate the iterated integral by converting to polar coordinates. 4-y2 (x + y) dx dy 0,

2-Change the Cartesian integral in to an equivalent polar integral, then evaluate polar integral (x² + y?)dxd

Compute the area A bounded by the line r = e and the rays 0 = 0, and 0 = as an integral in polar coordinates. (Use symbolic notation and fractions where needed.) A =