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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 value of `sec. (pi)/(7)+ sec. (3pi)/(7) + sec. (5pi)/(7) ` is

A

(a)4

B

(b)-4

C

(c)3

D

(d)-3

Text Solution

Verified by Experts

The correct Answer is:
A
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