If $z^2 =f(x,y)$ then find $∂z/∂x$

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If $z^2 =f(x,y)$ then find $∂z/∂x$

how to find $∂z/∂x$

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$2 zz_{x}=f_{x}(x,y)$ and $z_{x} =\frac{f_{x}(x,y)}{2z}$