lim(2^x-1)/x x趋向于0 怎么算

lim(1-2x)^1/x x趋向于0 lim(x趋向于0)(x*cotx-1)/(x^2) 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趋向于0）（1-cosx)/x^2 求lim x趋向于0(arctanx)/(x^2+1) lim(1+e^1/x)^x,x趋向于+0 求lim x趋向于0(e^x-x-1) x趋向于0 lim loga(1+x)/x= lim(1+3x)^3/x x趋向于0 lim(1+3x)^(2/x)x趋向于零 lim(1-2x)^(1/x)=?lim下面是X趋向于0 lim(1+2tanx)^cotx (x趋向于0) lim((1+x)^5-(1+5x))/(x^2+x^5) x趋向于0 lim (1+x)^5+(1+5x)/(x^2+x^5) x趋向于0 求lim x趋向于0(arctanx)/(x^+1) lim(cotx-1/x) x趋向于0 lim x趋向于0,sec^2*x等于什么? (1-x)tan(πx/2),lim 趋向于1,