lim(x→0) arctanx / 2x ＝1/2怎么来的

lim(x→0 )(arctanx/x)^(1/x^2)求极限求lim(x→0 )(arctanx/x)^(1/x^2) lim(x+arctanx)/(x-arctanx) (x→∞) 求lim(x→0)arctanx/x的极限, lim(x→+∞)(2/π*arctanx)^x求极限 求极限lim(2/π*arctanx)^x x→∞ lim(x→+∞)(π/2-arctanx)/(sin1/x) lim(x→+∞)(π/2-arctanx)/sin1/x, 求lim x趋向于0(arctanx)/(x^2+1) lim (π/2-arctanx)/1/x x大于0 lim(x→0)=（arctanx-x）/ln(1+2x^3) lim x→-∞ arctanx/2求极限 lim(x→0) arctanx / 2x ＝1/2怎么来的 求极限lim(x→0)sinxsin(1/x);lim(x→∞)(arctanx/x) lim(x→0) (1-cos(1-cosx))/(arctanx^2)^2求极限 lim(n趋近于0)(arctanx)/x lim(arctanx/sinx) x－>0 求lim(x→0) (1/x^2)ln(arctanx/x) 求这个极限时,能不能直接用arctanx~x代入?把 ln(arctanx/x)变成ln(x/x)?理由. lim x(π/2-arctanx)＝?lim下面是+∞