作业帮tan675°-sin(-330)-cos960°
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tan675°-sin(-330)-cos960°
tan675°-sin(-330)-cos960°
tan675°-sin(-330)-cos960°
tan周期是180,sin周期是360,cos周期是360
tan675°-sin(-330)-cos960°
=tan(675-180*3)-sin(-330+360)-cos(960-360*2)
=tan135-sin30-cos240
=-1-1/2+根号3/2
=(根号3-3)/2