lim√（1+x+x^2）-1／x^3+sin^2x

求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 lim tan x - sin x / x³ lim eˆ2x - 1 / x lim(x趋向0)ln(1+sin x)/x^2 lim(sin(x^2*cos(1/x)))/x怎么做? 求极限lim(x-->0)x^2 sin(1/x), 求极限 1,lim(x→∞）（sinx/x +100) 2,lim(x→∞）xtan1/x 3,lim(x→1）sin^ lim[sin(x-3)]/√(1+x) -2 x趋于3求极限 急 x趋向于无穷时 lim (3x-1)/(x^3 乘以 sin(1/x^2 )) 求极限 lim sin(x^2 * sin (1/x))/x x->0 lim x->0(sqrt(sin(1/x^2)) 求极限 求极限（X趋于1）lim{[sin(x-1)]^2}/x-1 求极限lim（x→1）（1-x^2）/(sinπx)