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53. If z = f(@, y) , where x = r cos d and y = r sin 0, show that 1 02z 1 Oz

53. If z = f(@, y) , where x = r cos d and y = r sin 0, show that 1 02z 1 Oz a2 z a2 z a2 z + = ay2 ar2 72 202 r ar49, 50, 51, 52, 53 and 54 Assume that all the given functions have continuous second-order partial derivatives

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