tan11π/*6cos(-25π/6)*sin(-23π/6)sin25π/6*cos11π/3+1/4tan(-29π/4)第一题应该是 tan11π/6*cos(-25π/6)*sin(-23π/6)
问题描述:
tan11π/*6cos(-25π/6)*sin(-23π/6)
sin25π/6*cos11π/3+1/4tan(-29π/4)
第一题应该是 tan11π/6*cos(-25π/6)*sin(-23π/6)
答
第一题:=tan(-π/6)*cos(-π/6)*sin(π/6)=-1/4
第二题:=sin(π/6)*cos(-π/3)+1/4*tan(-π/4)=0