lim(x趋向2) (x-2)^2=0的标准证明过程?

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) e^x+2= lim(x趋向0)((sinx/x)+1)=2? lim(1-2x)^(1/x)=?lim下面是X趋向于0 lim((1/x2)-(ctgx)2) x趋向0的极限值 lim(x趋向0) x^2 / (sin^2) * x/3 lim(x趋向0) x^2 / (sin^2) * x/3 lim(x^2+1)/(2x^+1) x趋向0 lim x趋向0 x^2-sinx/x+sinx lim(x趋向0)ln(1+sin x)/x^2 lim(x趋向于0)(x*cotx-1)/(x^2) lim x趋向0 (1+cos^2(1/x))^x lim(1-2x)^1/x x趋向于0 lim x趋向无穷大 (1+2/x)^x=? lim(x趋向2) (x-2)^2=0的标准证明过程? 若lim[x/f(3x)]=2(x趋向于0）,则lim[f(2x)/x]=?(x趋向于0) lim h趋向0 (x+h)^2-x^2/h 求极限lim【1-cosmx)/x^2】,x趋向0