函数y=1sinx?cotx

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函数y=1sinx?cotx
======以下答案可供参考======
供参考答案1:
y=(1-cosx)/sinx
={1-[1-2sin²(x/2)]}/2sin(x/2)cos(x/2)
=2sin²(x/2)/2sin(x/2)cos(x/2)
=sin(x/2)/cos(x/2)
=tan(x/2)
所以T=π/(1/2)=2π