sin^2 45°-cos60°+tan60°*cos30°

问题描述:

sin^2 45°-cos60°+tan60°*cos30°

1/2-1/2+√3*√3/2=3/2

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