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Find all values of x in (-pi,pi) satisfy...

Find all values of x in `(-pi,pi)` satisfying the equation `8^(1+cosx+cos^(2)x+...)=4^(3).`

A

`+-pi//4, +-2pi//3`

B

`+-pi //6, +-2pi//3`

C

`+-pi//3 , +-2pi//3`

D

`+-pi//2, +-2pi//3`

Text Solution

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The correct Answer is:
C
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