I.1.59 Double Integrals

Condition: calculate the integral \ (\ iint _ {\ delta} \ left (x^{2}+y^{2} \ right) d x d y \) if the area is \ delta \) is limited by lines \ (y = x, x = 0, y = 1, y = 2 \))

Double and itieded integrals over Various Areas of Integration, Conversion from Cartesian to Polar Coordinates, Calculation of the Jacobian, Changing the Integration, Transformation of Variables in the Integral.