differentiation

Question: If $u={{x}^{2}}+{{y}^{2}}$ and $x=s+3t,y=2s-t,$ then $\frac{{{d}^{2}}u}{d{{s}^{2}}}=$

1) 12

2) 32

3) 36

4) 10

Solution:

Explanation: No Explanation

Differentiation by substitution Higher order derivatives

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