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`

Verified by Experts

The correct Answer is:

A

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