If x=a sin theta, y=b cos theta, then (d...

If `x=a sin theta, y=b cos theta`, then `(d^2y)/(dx^2)` when `theta =pi/4` is given by

A

`-2sqrt2 b/a^2`

B

`2 sqrt2 b/a^2`

C

`(sqrt2 a^2)/b`

D

`(2a^2)/b`.

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