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# Find the partial derivative with the chain rule?

## Find partial derivative of $u$ with the chain rule at $t = 0$ and $s = 2$ when $u \left(x , y\right) = \sqrt{5 {x}^{2} + 2 {y}^{2}} ,$ $x \left(t , s\right) = {e}^{s t} ,$ $y \left(t , s\right) = 5 + {s}^{2} \cos \left(t\right) .$

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