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Prove that sinfrac {pi}{14} is a root of...

Prove that `sinfrac {pi}{14}` is a root of the equation `8x^(3) -4x^(2) - 4x +1 = 0`.

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A DAS GUPTA-Circular Functions, Identities -Exercise
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  14. A factor of cos 4theta - cos 4phi is

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  15. The chord AB of a circle subtends an angle of frac {2pi}{3} at a point...

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  18. Prove that sinfrac {pi}{14} is a root of the equation 8x^(3) -4x^(2) -...

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