If u = x^(2) + y^(2) " and " x = s + 3t...

If ` u = x^(2) + y^(2) " and " x = s + 3t, y = 2s - t , " then " (d^(2) u)/(ds^(2))` is equal to

A

(a) 12

B

(b) 32

C

(c) 36

D

(d) 10

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The correct Answer is:

D

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