If u=x^2+y^2 and x=s+3t,y=2s-t, then (d^...

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

A

12

B

32

C

36

D

10

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If u=x^2+y^2 and x=s+3t,y=2s-t, then (d^2u)/(ds^2)=
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If u=x^2 and x=s+3t, y=2s-t, then (d^2u)/(ds^2) is (a) 5/2 t (b) 20t^...
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