相关cos1110的文学知识

 sin(-1320°)cos(1110°)+cos(-1020°)sin750°=   

 sin(-1320°)cos(1110°)+cos(-1020°)sin750°=   

问题详情: sin(-1320°)cos(1110°)+cos(-1020°)sin750°= 【回答】1=sin(-4×360°+120°)cos(3×360°+30°)+cos(-3×360°+60°)sin(2×360°+30°)=sin120°cos30°+cos60°sin30°=×+×=1.知识点:三角函数题...