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If the equation cos 3 x cos^(3) x + sin...

If the equation ` cos 3 x cos^(3) x + sin 3 x sin^(3) x =0` , then x is equal to

A

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

B

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

C

`(npi)/(4)`

D

None of these

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A
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