极限lim x→-∞(x+2)/(x^2+2)=?最好能写出解题过程

lim(x→+∞)(2/π*arctanx)^x求极限 求极限lim(2/π*arctanx)^x x→∞ 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 求极限 lim [(3+x)/(6+x)]^[(x-1)/2]= x→∞求极限 lim [(3+x)/(6+x)]^[(x-1)/2]=x→∞ lim(x→∞)(x^2+x)/(x^4-3x-1)的极限 lim(x→∞)[（x^3+x^2+x^1+1)^(1/3) - x] 的极限. 求极限,lim(x→+∞)[1+1/(2x)]^x求上式极限, 极限lim(x→0)(1-2/x)^x lim(x→0)(1-2x)^1/x 极限? 求1、lim(x→∞)10^1/x的极限 2、lim(x→1)arctanx的极限, 求极限lim(x→∞)(2x/3-x)-(2/3x)求极限lim(x→5)根号(x-1)-2/x-5 极限：lim(x->2)1/(x-2) lim 3x^2-3x+2／x^2-4 求极限x→∞ lim (x-2/x+2)^x+2 x→∞ 请问这题求极限是怎样解, 求极限lim(x→∞)2x^2-x/x^2+4 lim(x→∞)[(sinx)^2+x/cos^2x-x]求极限 求极限lim(x→∞)(1+1/x)(2-((x+1)/x^2)*arctanx) lim（2x-1／2x+1）^x 求极限x→∞