If \( 7 \theta=(2 n+1) \pi \), where \( n=0,1,2,3,4,5,6 \), then answer the following questions.... VIDEO
If \( 7 \theta=(2 n+1) \pi \), where \( n=0,1,2,3,4,5,6 \), then answer the following questions.
The value of \( \sec \frac{\pi}{7}+\sec \frac{3 \pi}{7}+\sec \frac{5 \pi}{7} \) is
(a) 4
(b) \( -4 \)
(c) 3
(d) \( -3 \)
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