求lim x趋向于负无穷 (x/x+1)arctanx

求lim x趋向于负无穷 (x/x+1)arctanx 求lim x趋向于0(arctanx)/(x^2+1) 【求极限】(x趋向正无穷)lim((x^2)/arctanx). lim((4x^2+x-1)^1/2+x+1)/（x^2+arctanx）^1/2(x趋向于负无穷) 用无穷小量的性质求下列极限,1,x趋向于0,limx^2cos(1/x) 2,x趋向于无穷大,lim(arctanx/x lim(arctanx/x)的极限x趋向无穷 lim(x趋向于负无穷)((x^2+1)^1/2+x)怎么做? lim(x趋向于无穷)(1+3/x)^(x-3) 求极限lim(e^3x-5x)^1/x x趋向于正无穷 求lim x趋向于无穷时(-X)/(2X^2+3x-1)答案 求极限lim(π/2-arctanx)/(1/x),x趋近于正无穷 lim(1-2/x)^x/2+1(x趋向于无穷)求极限