计算不太明白...求值sin(-1320°）*cos1110°+cos（-1020°）sin750°+tan（-405°）求值sin25π/6+cos25π/3+tan25π/4+sin7π/3*cos13π/6-cos5π/3
问题描述：
计算
不太明白...
求值sin(-1320°）*cos1110°+cos（-1020°）sin750°+tan（-405°）
求值sin25π/6+cos25π/3+tan25π/4+sin7π/3*cos13π/6-cos5π/3
答
sin60°*√3/2+cos(180°+120°)*1/2-1=3/4-cos120°-1=3/4-1/4-1=-1/2
答
sin(-1320°）*cos1110°+cos（-1020°）sin750°+tan（-405°）=sin120°cos30°+cos60°sin30°-tan45°=sin60°cos30°+cos60°sin30°-tan45°=3/4+1/4-1=0sin25π/6+cos25π/3+tan25π/4+sin7π/3*cos13π/6-co...