tan12分之派的三角函数值
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tan(π/12)
=sin(π/12)/cos(π/12)
=2sin²(π/12)/[2sin(π/12)*cos(π/12)]
=[1-cos(π/6)]/sin(π/6)
=(1-√3/2)/(1/2)
=2-√3
=sin(π/12)/cos(π/12)
=2sin²(π/12)/[2sin(π/12)*cos(π/12)]
=[1-cos(π/6)]/sin(π/6)
=(1-√3/2)/(1/2)
=2-√3
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