bryamykayl3alaze bryamykayl3alaze

24-11-2016
Mathematics

Answered

Solve Cos^2(5pi/12) using double angle rules.

I've looked up double angle rules online but nothing has helped thus far

Verified Answer :

andriansp andriansp

25-11-2016

cos^2 x = 1+cos2x/2

cos^2 5pi/12 = 1+cos 5pi/6 / 2

= [1+ (-√3/2)]/2

= [2 - √3]/4

Hope this helps

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