# Partial derivatives

Calculus Level 4

Find $$\frac { \delta w }{ \delta x }$$ at the point $$(x,y,z)=(2,-1,1)$$ if $$w={ x }^{ 2 }+{ y }^{ 2 }+{ z }^{ 2 }$$ , $${ z }^{ 3 }-xy+yz+{ y }^{ 3 }=1$$ , and $$x$$ and $$y$$ are the independent variables.

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