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If cos^(3) theta + cos^(3)((2pi)/(3) + t...

If `cos^(3) theta + cos^(3)((2pi)/(3) + theta) + cos^(3)((4pi)/(3) + theta) = a cos 3 theta`, then a =

A

`(1)/(4)`

B

`(3)/(4)`

C

`(5)/(4)`

D

`(7)/(4)`

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The correct Answer is:
b
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