sin²60°+cos²60°、tan45°-sin30°×cos60°、cos²45°/tan²30°

分类: 作业答案 • 2021-12-03 13:14:25

问题描述：

答

sin²60°+cos²60°
=3/4+1/4
=1
tan45°-sin30°×cos60°
=1-1/2×1/2
=3/4
cos²45°/tan²30°
=(1/2)/(1/3)
=3/2