lim(x->0)(2xsinx)/(secx-1)
lim[ln(1+x^2)]/(secx-cosx) x->0
lim(x趋于0时)secx - 1/x^2 ,
lim (1/(xsinx)-1/x^2)x~0
lim x→0 1-cosx/xsinx
lim(x→0)(1-cos2x)/xsinx
X趋向0 lim(xsinx)/(1-cosx)
lim(x→0)(1-cos4x)/xsinx
lim(x→0) sinx-x(x+1)/xsinx
求极限lim x→0 (1/xsinx+xsin1/x)
:lim(xsin1/x+1/xsinx)x趋于0
lim(x→0)x/(xsinx)=0和lim(x→0)(xsinx)/x=1
lim(x→0)(1-cosx)/(xsinx)=?