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2*sin(60°-B)*sinB =2*(sin60°*cosB-cos60°*sinB)*sinB =sin60°*2*cosB*sinB-cos60°*2*sinB*sinB =sin60°*sin2B-cos60°(1-cos2B) =cos60°*cos2B+sin60°*sin2B-cos60° =cos(60°-2B)-cos60°
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