Answer
$\frac{∂_w}{∂_s}= \frac{∂_w}{∂_u}\times\frac{∂_u}{∂_s}$
Work Step by Step
$\frac{∂_w}{∂_t}= \frac{∂_w}{∂_u}\times\frac{∂_u}{∂_t}$
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