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

If `u=x^2 and x=s+3t, y=2s-t,` then `(d^2u)/(ds^2)` is (a) `5/2 t` (b) `20t^8` (c) `5/(16t^6)` (d) non of these

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