cos(2x-6°) = cos square 30°-cos squrare 60°
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cos(2x-6)=cos(√3/2)^2 -cos(1/2)^2
cos(2x-6)=cos(3/4)-cos(1/4)
(2x-6)=2/4
2x=1/2+6
2x=13/2
x=13/4
cos(2x-6)=cos(3/4)-cos(1/4)
(2x-6)=2/4
2x=1/2+6
2x=13/2
x=13/4
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