1. z'x=3x²y² z'y=2x³y2. z'x=4x³ z'y=3y³3. z'x=ye^(xy)+2xy z'y=xe^(xy)+x²4. u'x=(z/y)x^(z/y-1) u'y=x^(z/y)*(lnx)(-z/y²)=-(z/y²)*x^(z/y)*(lnx)u'z=x^(z/y)*(lnx)(1/y)=(1/y)*x^(z/y)*(lnx)
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