32. solve: dx t dy + (x+ytz + 1) dz =0 (a) x+y +z = aex (b) xtytz = ae (c) x+y +z = aez (d) none of these 33. solve: 2yz dx - 3zx dy-4x)y dz = 0 (a) = cy3z4 (b)

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