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Prove that tan(pi/10) is a root of polyn...

Prove that `tan(pi/10)` is a root of polynomial equation `5x^4-10 x^2+1=0.`

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CENGAGE PUBLICATION-TRIGONOMETRIC FUNCTIONS-All Questions
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  3. Prove that tan(pi/10) is a root of polynomial equation 5x^4-10 x^2+1=0...

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  4. If sinx+cosx=sqrt(y+1/y) for x in [0,pi] , then

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  12. The solution set of the system of equations x+y=(2pi)/3,cosx+cosy=3/2,...

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  13. The positive integer value of n >3 satisfying the equation 1/(sin(pi/n...

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