sin^2 45°-cos60°+tan60°*cos30°
问题描述:
sin^2 45°-cos60°+tan60°*cos30°
答
1/2-1/2+√3*√3/2=3/2
答
sin^2 45=1/2
cos60°=1/2
tan60°*cos30°=tan^2(60)=1/3
1/2-1/2+1/3=1/3
亲不懂再问哦