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sin 12 cos 72 - cos 33 cos 27
sin(84)-sin(60)-cos(60)-cos6=sin(90-6)-sqrt(3)/2-1/2-cos6=-(sqrt(3)+1)/2
sin 12 cos 72 - cos 33 cos 27=-(sqrt(3)+1)/4
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sin(84)-sin(60)-cos(60)-cos6=sin(90-6)-sqrt(3)/2-1/2-cos6=-(sqrt(3)+1)/2
sin 12 cos 72 - cos 33 cos 27=-(sqrt(3)+1)/4