tan30°sin60°+cos^30°-sin^45°tan45°
问题描述：
tan30°sin60°+cos^30°-sin^45°tan45°
答
tan30°sin60°+cos^30°-sin^45°tan45°
=根号3/3*根号3/2-(根号3/2)^2-(根号2/2)^2*1
=1/2-3/4-1/2
=-3/4