If x=3 cos t and y=4 sin t, then (d^2y)/...

If `x=3 cos t and y=4 sin t`, then `(d^2y)/(dx^2)` at the point `(x_0,y_0)=(3/2sqrt2,2sqrt2)`,is

A

`(4sqrt2)/9`

B

`-(4sqrt2)/9`

C

`-(8sqrt2)/9`

D

`(8sqrt2)/9`

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The correct Answer is:

C

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