question_answer

Directions: Based on the following paragraph.

If \[\cos \,\,\frac{\pi }{7},\] \[cos\,\,\frac{3\pi }{7},\] \[\cos \,\,\frac{5\pi }{7}\] are the roots of the equation \[8{{x}^{3}}-4{{x}^{2}}-4x+1=0\]

Find the value of\[\sec \,\,\frac{\pi }{7}+\sec \,\,\frac{3\pi }{7}+\sec \,\,\frac{5\pi }{7}\].

A)  2                                

B)  4

C)  8                                            

D)  All of these

E)  None of these