show sketches and complete solutions

a) Set up an iterated double integral using polar coordinates equivalent to the given vx2 + yz dA. Here, R is the region located in the 1st quadrant inside the rose r = cos 30. Show the sketch the diagram. b) Solve for the equation of the tangent plane to the surface with the equation R(x, y) = (x2 + yz, x - 2y, 2x + y) at point wherein (x, y) = (2, -1)