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#1 Help Me ! » Calculating exact values for cos(x) » 2008-12-28 04:44:32

henkverhelle
Replies: 2

It's possible to calculate certain values
for cos(x) analytically
like cos(45°),cos(30°)
but also
cos(12°) and cos(18°)
My questions is how is it done e.g. cos(18°) ?

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