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Solve : cos 3x. Cos^(3)x+sin 3x.sin^(3)x...

Solve : `cos 3x. Cos^(3)x+sin 3x.sin^(3)x=0`

A

`(2n+1)""(pi)/(4)`

B

`(2n-1)""(pi)/(4)`

C

`(npi)/(4)`

D

None of these

Text Solution

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The correct Answer is:
A
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