𝜕z𝜕x=𝜕𝜕x(4x3y2)=4y2⋅𝜕𝜕x(x3)=4y2(3x2)=12x2y2partial z over partial x end-fraction equals the fraction with numerator partial and denominator partial x end-fraction open paren 4 x cubed y squared close paren equals 4 y squared center dot the fraction with numerator partial and denominator partial x end-fraction open paren x cubed close paren equals 4 y squared open paren 3 x squared close paren equals 12 x squared y squared Treat as a constant:
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by Matt Boelkins et al. (Grand Valley State University)