If \( 7 \theta=(2 n+1) \pi \), where \( n=0,1,2,3,4,5,6 \), then answer the following questions....
If \( 7 \theta=(2 n+1) \pi \), where \( n=0,1,2,3,4,5,6 \), then answer the following questions.
The equations whose roots are \( \cos \frac{\pi}{7}, \cos \frac{3 \pi}{7}, \cos \frac{5 \pi}{7} \) is
(a) \( 8 x^{3}+4 x^{2}+4 x+1=0 \)
(b) \( 8 x^{3}-4 x^{2}-4 x-1=0 \)
(c) \( 8 x^{3}-4 x^{2}-4 x-1=0 \)
(d) \( 8 x^{3}+4 x^{2}+4 x-1=0 \)
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