If x=sqrt(3)(3 sin theta+sin 3theta), y=...

If `x=sqrt(3)(3 sin theta+sin 3theta), y=sqrt(3)(3 sin theta+cos 3 theta)`, find `(d^(2)y)/(dx^(2))` at `theta=(pi)/(3)`.

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The correct Answer is:

`(16sqrt(3))/(9)`

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