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 \[8{{x}^{3}}-4{{x}^{2}}-4x+1=0\] |
A) \[\frac{1}{4}\]
B) \[\frac{1}{8}\]
C) \[\frac{\sqrt{7}}{4}\]
D) \[\frac{\sqrt{7}}{8}\]
E) None of these
Correct Answer: B
Solution :
Not AvailableYou need to login to perform this action.
You will be redirected in
3 sec