Assume that all the given functions have continuous second-order partial derivatives. If z = f(x, y), where x = 2r cos(0) and y = 2r sin(8), find the following. az (a) ar az (2 cos (0) 2 sin(0)) az ar ax (b) az az az -2r sin (0)) + z( 2rcos(0)) a2z (c) ar ae ( 2 cos(0) -2 sin (0) Day ax ar de ay2 ax2

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