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July 28, 2015

Homework Help: Trig Help!

Posted by Anonymous on Friday, April 27, 2012 at 11:59pm.

Question: Trying to find cos π/12, if cos π/6 = square root 3 over 2, how to find cos π/12 using DOUBLE angle formula?

This is what I got so far..
cos 2(π/6) = cos (π/6 + π/6)
= (cos π/6)(cos π/6) - (sin π/6)(sin π/6)
= cos^2 π/6 - sin^2 π/6

Is that right? Please and thank you.

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