3. Let z = f(x, y) be a differentiable function of r and y, and let...

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3. Let z = f(x, y) be a differentiable function of r and y, and let r = r cos 0 and y = r sin 0 for r >0 and 0 < 0 < 2n. Show that 1 (dz\2 dz 2 2 2 )": (10pt) ду 3. Let z = f(x, y) be a differentiable function of r and y, and let r = r cos 0 and y = r sin 0 for r >0 and 0 < 0 < 2n. Show that 1 (dz\2 dz 2 2 2 )": (10pt) ду