Find Cartesian Equation and identify it r2sintheta2costheta

Solution

Just multiply both sides by r and then use rcos(theta) = x and rsin(theta) = y and r^2 = x^2 + y^2. So you get r^2 = 2rsin(theta) + 2rcos(theta), or x^2 + y^2 = 2y + 2x.