If x=e^t sin t , y=e^t cos t, t is a par...

If `x=e^t sin t , y=e^t cos t`, t is a parameter , then `(d^2y)/(dx^2)` at (1,1) is equal to

A

`-1//2`

B

`-1//4`

C

0

D

`1//2`

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The correct Answer is:

A

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