If u=x2+y2 and x=s+3t, y=2s−t, where s and t are independent of each – InterviewSolution

1.	If u=x2+y2 and x=s+3t, y=2s−t, where s and t are independent of each other, then the value of d2uds2 is
Answer» If $u = x^{2} + y^{2}$ and $x = s + 3 t, y = 2 s - t,$ where $s$ and $t$ are independent of each other, then the value of $\frac{d^{2} u}{d s^{2}}$ is

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