Use the Chain Rule to find the indicated partial derivatives. z=x^4+x^2y, x=s+2t-u,

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Use the Chain Rule to find the indicated partial derivatives. z=x^4+x^2y, x=s+2t-u, y=stu^2 curlz/curls, curlz/curlt, curlz/curlu when s=4, t=2, u=1