1. In each of the following, find the partial derivatives. (a) f(x,y) = ry² (b) f(x, y) = 1/y %3D 1 (h) 1 (c) f(x, y) = 1² + y3 (i) z = Vr² + xy + 2y² 1 (d) f(x,y) = (G) f(r, y, z) = y z HIN 117

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