tan5π/4=tanπ/4
所以用和角公式 (tan45+tan5π/12)/（1-tan45*tan5π/12）
所以等于-根號3
tan45=1 tan5π/12*1=tan5π/12*tan45
怎么不對了
化簡(tan5π/4+tan5π/12)/(1-tan5π/12)
化簡(tan5π/4+tan5π/12)/(1-tan5π/12)
注意分母啊 細心!
注意分母啊 細心!
數(shù)學(xué)人氣：246 ℃時間：2020-07-29 14:28:50
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