lim(1-2/x)^x/2+1(x趋向于无穷)求极限

lim(x^2+1)/(2x^+1) x趋向0 lim(x趋向无穷大)[1+2/(x+2)]^(x+2) lim(x趋向无穷)-(x+1)+√(x^2+1) lim x趋向0 (1+cos^2(1/x))^x lim(1-2x)^1/x x趋向于0 lim(x趋向无穷)[1-(2/x)]^3x lim(x趋向0)ln(1+sin x)/x^2 lim x趋向无穷大 (1+2/x)^x=? lim（x/（1+x^2））,x趋向无穷大 lim(x趋向于0)(x*cotx-1)/(x^2) lim(1+3x)^(2/x)x趋向于零 f(x)={x x=1}求lim x趋向于1- f(x) lim x趋向于1+ f(x) lim趋向于1 f(x)f(x)={2x-1 x0} 求lim x趋向于0- f(x) lim x趋向于0+ f(x) lim趋向于0 f(x) lim(x趋向0+)x/[(1-cosx)^(1/2)] lim x趋向1 lnx/(x-1)^2洛必达法则 (1-x)tan(πx/2),lim 趋向于1, 求极限lim【1-cosmx)/x^2】,x趋向0 lim（x趋向于0）（1-cosx)/x^2 求lim x趋向于0(arctanx)/(x^2+1)