se the Chain Rule to find the indicated partial derivatives. z = x4 + x2y,    x = s + 2t − u,    y = stu2;   ∂z ∂s,  ∂z ∂t,  ∂z ∂u    when s = 1, t = 3, u = 5 ∂z ∂s  =        ∂z ∂t  =        ∂z ∂u  =

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