x=cos y, then (d^2y)/(dx^2) =...

`x=cos y`, then `(d^2y)/(dx^2) =`

A

`-cosec y cot^2 y`

B

`cosec y cot^2 y`

C

`-cosec^2 y cot y`

D

`cosec^2 y cot y`

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The correct Answer is:

C

x=cos y, then (d^2y)/(dx^2) =
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