不对
cot(x/2)
=cos(x/2)/sin(x/2)
=2cos²(x/2)/[2sin(x/2)cos(x/2)]
=(1+cosx)/sinx
或者
cot(x/2)
=cos(x/2)/sin(x/2)
=2sin(x/2)cos(x/2)/[2sin²(x/2)]
=sinx/(1-cosx)
cos2x/(1-sin2x)可以化简为tan或者cot吗?
化不了cos2x/(1-sin2x)=(cos²x-sin²x)/(sin²x-2sinxcosx+cos²x)=(cosx-sinx)(cosx+sinx)/(cosx-sinx)²=(cosx+sinx)/(cosx-sinx)请点击“采纳为满意答案”,祝学习进步!