计算

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

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...