请问 ln c - ln cosx ,为什么是(+-C1^2) / cos^2 x
1/2ln/(1-cosx)/(1+cosx)/为什么等于ln/(1-cosx)/sinx/
求极限lim(1-cos(1-cosX))/(sinx^2*ln(1+x^2))有图.
求∫sinx dx/(sinx+cosx)的积分,x/2-ln|sinx+cosx|+c
求 lim ln(1+x+2x^2)+ln(1-x+x^2)/secx-cosx
1、lim ln(1+x+2x^2)+ln(1-x+x^2)/secx-cosx
lim{[3sinx+(x^2)*cos(1/x)]/[(1+cosx)ln(1+x)]}(x趋近于0)
∫sinx/cos^3x dx=∫tanxsec^2xdx=∫tanxd(tanx)=-ln|cosx|+c 这我自己做
lim(x→0) (ln cosx)/[ln(1+x^2)] 等于多少?
lim(x→0)(cosx)^(1/ln(1+x^2))
lim(x→0)(ln(1+x^2)/(sec-cosx))
lim[ln(1+x^2)]/(secx-cosx) x->0
lim x→0[ln(cosx)]/x^2