If $z = f ( x , y )$ And $x = s + t , y = s - t$

question 122

Essay

If $z = f ( x , y )$ and $x = s + t , y = s - t$ , then simplify $\left(\frac{\partial z}{\partial s}\right)\left(\frac{\partial z}{\partial t}\right)$ in terms of $f _ { x }$ and $f _ { y }$ .

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Office Equipment

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