I. If z = In(xyz) implicitly defines a function, then ∂z/∂y = z / (z−y) II. Any function of the form z= f(x+t) + g(x−t) with f,g functions of one variable and of class C2 satisfies ∂2z / ∂x2 =d2f / du2+ d2g / dv2 and ∂z/ ∂t = df / du - dg / dv which is correct, incorrect or both

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