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How to find value of cos …

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How to find value of cos 20 degree

Posted by Aman Srivastava 6 years, 9 months ago

Sunil C N 6 years, 8 months ago

{tex} \cos 3\theta = 4{\cos ^3}\theta - 3\cos \theta \\ take \theta =20 \\ \frac{1}{2} = 4{x^3} - 3x \\ 8{x^3} - 6x-1=0 {/tex}

solve the equation

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