lim x →2 （2/2x-x^2 +1/x^2-3x+2）求极限

lim(x(sin)^2) Lim [x^2/(x^2-1)]^x (x→∞) lim xsin(2/x) x→∞ lim(1+x/x)2x (x→∞) lim(x→0)e^x-x-1/x^2 lim x→1 x-1/x^2-x lim(x→0)[e^x-e^(2x)]/x lim(1-x)^(2/x) x->0 lim(x)lim(x→∞) [(x-1)/(x+1)]^2x 为什么 lim(x->∞) {[(-2)/(x+1)]*2x} = -4 lim x→∞ (x+sin 2x)/2 lim(x→0)(cosx-cos^2x)/x^2 lim(x→∞)(1-2/x)^2x x/2-1lim(1-2/x)x→∞ lim(x→0) (3x^2-5x+2), 极限lim(x→0)(1-2/x)^x lim(x→0)(1-2x)^1/x 极限? lim x→∞(2x+1)/(3x-4) lim(x→0) (e^(-1/x^2))/x^100