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4 cos(П/2-(П/3+a))sin(П/3-a)=2(cos2a-cos2П/3)=2(1-2sin^2a+1/2)=3-4sin^2a=
=(3sina-4sin^3a)/sina=sin3a/sina
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4 cos(П/2-(П/3+a))sin(П/3-a)=2(cos2a-cos2П/3)=2(1-2sin^2a+1/2)=3-4sin^2a=
=(3sina-4sin^3a)/sina=sin3a/sina