求导 y=ln(tan(x/2))

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求导y=ln(tan(x/2))求导y=ln(tan(x/2))求导y=ln(tan(x/2))y''=1/(tan(x/2))*(tan(x/2))''=1/(tan(x/2))*(sec^2(x/2)

求导 y=ln(tan(x/2))
求导 y=ln(tan(x/2))

求导 y=ln(tan(x/2))
y'=1/(tan(x/2))*(tan(x/2))'=1/(tan(x/2))*(sec^2(x/2))*(x/2)'=1/(2sin(x/2)*cos(x/2))=1/sin(x)=csc(x)