Sin75°/Cos75°+Cos75°/Sin15°
=Sin75°/Cos75°+Cos75°/Cos75°
=tan75°+1
=tan(30°+45°)+1
=（tan30°+tan45°）/(1-tan30°*tan45°) +1
=3+√3
Sin75°/Cos75°+Cos75°/Sin15°=?
3个回答
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