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1. Find the first and second partial derivatives: A. z=f(x,y) = x2y3 - 4x2 + x2y-20 B. z=f(x,y) = x+ y - 4x2 + x2y-20 2. Find
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0 2=+(2,) - %93-4r? + xy -20 partic ciate with respect a Falx,y) = y yaxr8x+ gx.2000 g-term is constant Fm 19,g) = 2x2y3 -8

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