Q.5 let f: r r be a twice differentiable function. if g (u, v) = f(u2 - v2), then ag (a) 4(u2v2)f" (u2 -v2) (b) 4(u2 + v2)f (u2- v?) (c) 2f (u2 - v2) + 4(u? - v

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