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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

-24

B

80

C

24

D

-80

Text Solution

Verified by Experts

The correct Answer is:
C
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