求极限lim(x→0)sinxsin(1/x);lim(x→∞)(arctanx/x)

求极限lim(x→0)sinxsin(1/x);lim(x→∞)(arctanx/x) 求极限lim Ln(1+x) /x > .< x→0 求极限lim(x→0)x²/1-cosx 求极限lim(x→0) cos(1/x) 求lim(1-cos2x)/x^2极限,x→0 求极限lim(x→0)(cosx-(1/x)) 求极限lim x→0 (1/xsinx+xsin1/x) 求极限lim(x→0) (1-sinx)^(2/x) 求极限 lim(x→0)(1-sinx)^(2/x) 求极限lim→0（1/x）求详解? 求极限Lim(x→0)1/xsinx-1/xtanx 数学求极限lim x→0 ( x3/1-cosx) 求下列极限lim(x→0)(1-cosx)/xsinx 求极限lim(x→0) tanx-sinx/1-cos2x 求极限：x→0 lim[(1+tanx)^cotx] 求极限 lim→0（cosx）^(1/x) 求极限lim x→∞ (x/(1+x))^x 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限