bryamykayl3alaze bryamykayl3alaze
  • 24-11-2016
  • Mathematics
contestada

Solve Cos^2(5pi/12) using double angle rules.
I've looked up double angle rules online but nothing has helped thus far

Relax

Respuesta :

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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