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IF y=cos^2((3x)/2)-sin^2((3x)/2),then(d^...

IF `y=cos^2((3x)/2)-sin^2((3x)/2)`,then`(d^2y)/(dx^2)`is

A

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

B

9y

C

`3sqrt(1-y^2)`

D

`-9y`

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The correct Answer is:
D
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