Question

\[\int\limits_{0}^{\pi/2}\int\limits_{3}^{6}(r \cos \theta)^{2}-2(r \sin \theta)^{2}r drd \theta\]

Answer 1

should there be an i before the sin ?

Answer 2

no

Answer 3

because if it is about polar coordinates it should be in rcis(theta) format. Are you sure there is no imaginary numbers anywhere in the question?

Answer 4

Evaluate the integral ∫∫R(x^2−2y^2)dA, where R is the first quadrant region between the circles of radius 3 and radius 6.

Answer 5

is the original question