If : y=cos^(2)((3x)/(2))-sin^(2)((3x)/(2...

If : `y=cos^(2)((3x)/(2))-sin^(2)((3x)/(2))," then: "(d^(2)y)/(dx^(2))=`

A

`-3sqrt(1-y^(2))`

B

9y

C

`-9y`

D

`3sqrt(1-y^(2))`

Verified by Experts

The correct Answer is:

C

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