化简(1+cos2x/sin2x)乘以(1+cosx/cosx)
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化简(1+cos2x/sin2x)乘以(1+cosx/cosx)
化简(1+cos2x/sin2x)乘以(1+cosx/cosx)
化简(1+cos2x/sin2x)乘以(1+cosx/cosx)
原式=(2cos²x)/(2sinxcosx)*(1+cosx)/cox
=(1+cosx)/sinx
=2cos²(x/2)/(2sinx/2cosx/2)
=cos(x/2)/sin(x/2)
=cot(x/2)