计算tan15°+cos15°/cos75°

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计算tan15°+cos15°/cos75°

计算tan15°+cos15°/cos75°
计算tan15°+cos15°/cos75°

计算tan15°+cos15°/cos75°
=sin15°/cos15°+cos15°/sin15°
=(sin²15°+cos²15°)/sin15°cos15°
=1/sin15°cos15°
=2/2sin15°cos15°
=2/sin30°
=4