help me to get started.
D is bounded by the circle with center the origin and radius 2.
When dealing with circles, I would suggest converting to polar coordinates.
Do you know the following formulae:
Also, do you know the Jacobian matrix for a change of variables in double integration?
Once you have converted to polar coordinates, your variables of integration will be r, the radius, and , the angle. Clearly, the limits for these are as follows: