计算tan15°+cos15°/cos75°
来源:学生学帮网 编辑:学帮网 时间:2024/06/17 21:45:01
计算tan15°+cos15°/cos75°
=sin15°/cos15°+cos15°/sin15°
=(sin²15°+cos²15°)/sin15°cos15°
=1/sin15°cos15°
=2/2sin15°cos15°
=2/sin30°
=4
计算tan15°+cos15°/cos75°
=sin15°/cos15°+cos15°/sin15°
=(sin²15°+cos²15°)/sin15°cos15°
=1/sin15°cos15°
=2/2sin15°cos15°
=2/sin30°
=4