Asked by Knights

Please help, I know cos 72 degrees = (sqrt 5 - 1)/4.

I need to know what cos 36 degrees is. How to do so?

12 years ago

Answered by Steve

since cos2x = 2cos^2 x - 1,

cos 36 = sqrt((1+cos 72)/2)

12 years ago

Answered by Knights

thx

12 years ago

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