计算tan15°+cos15°/cos75°

分类: 作业答案 • 2021-12-19 11:35:51

问题描述：

答

=sin15°/cos15°+cos15°/sin15°
=(sin²15°+cos²15°)/sin15°cos15°
=1/sin15°cos15°
=2/2sin15°cos15°
=2/sin30°
=4