sin^2(2p/3)/2)-cos^2(2p/3)/2)=sin^2 p/3 - cos^2 p/3= 1/4-3/4=-1/2
sin^2 x/2 - cos^2 x/2=-cos2*x/2=-cosx
-cos2пи/3=1/2
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sin^2(2p/3)/2)-cos^2(2p/3)/2)=sin^2 p/3 - cos^2 p/3= 1/4-3/4=-1/2
sin^2 x/2 - cos^2 x/2=-cos2*x/2=-cosx
-cos2пи/3=1/2