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If 7theta=(2n+1)pi, where n=0,1,2,3,4,5,...

If `7theta=(2n+1)pi`, where `n=0,1,2,3,4,5,6`, then answer the following questions.
The equations whose roots are `cos. (pi)/(7), cos. (3pi)/(7), cos. (5pi)/(7)` is

A

`8x^(2)+4x^(2)+4x+1=0`

B

`8x^(3)-4x^(2)-4x-1=0`

C

`8x^(3)-4x^(2)-4x-1=0`

D

`8x^(3)+4x^(2)+4x-1=0`

Text Solution

Verified by Experts

The correct Answer is:
B
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