令t=2a
a=t/2
則原式=sin2a/(1-cos2a)
=2sinacosa/[1-(1-2sin²a)]
=2sinacosa/2sin²a
=cosa/sina
=cota
=cot(t/2)
Sint/(1-cost)是如何得于Cot(t/2)的?
Sint/(1-cost)是如何得于Cot(t/2)的?
中間有個小錯誤是1-cos2a=[1-(1-2Sin^2a)].
中間有個小錯誤是1-cos2a=[1-(1-2Sin^2a)].
數學人氣:627 ℃時間:2020-09-10 03:12:57
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