How do you simplify this?

Question

#cos^(2)((x)/(2)-(\pi )/(6))#

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Answer 1 · 2018-03-16T17:25:35

#cos^2((3x-pi)/6)#

#cos^2(x/2 - pi / 6)#

Let's simplify #pi/2 - pi/6#

#3/3 xx x/2 - pi/6#

#(3x-pi)/6#

So our problem can be simplified to #cos^2((3x-pi)/6)#