计算tan15°+cos15°/cos75°

来源：学生作业学帮网编辑：学帮网时间：2024/05/27 08:58:27

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