Could someone help me to understand how to do this problem?
I believe Partial Derivatives are used. Thanks!
Hint. By the chain rule, $$W_s=F_uu_s+F_vv_s\ .$$ Make sure you substitute in the correct values of $s$ and $t$.
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Hint. By the chain rule, $$W_s=F_uu_s+F_vv_s\ .$$ Make sure you substitute in the correct values of $s$ and $t$.