化简sin(13派/6)+cos(7派/3)-tan(49派/4)

问题描述:

化简sin(13派/6)+cos(7派/3)-tan(49派/4)

原式=sin(2派+派/6)+cos(2派+派/3)-tan(12派+派/4) =sin派/6+cos派/3-tan派/4 =1/2+1/2-1 =0