化简(tan5π/4+tan5π/12)/(1-tan5π/12)
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2014-02-25
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(tan5π/4+tan5π/12)/(1-tan5π/12)=[tan(π+π/4)+tan5π/12]/(1-tan5π/12×tanπ/4)=(tanπ/4+tan5π/12)/[1-tan5π/12×tanπ/4]=tan(π/4+5π/12)=tan2π/3=-√3
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