Sin^2(2x)÷x^2(x→0)求极限

求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 求极限lim(x-->0)x^2 sin(1/x), 3道求极限的题目1.sin 2x/sin 5x （x→0）2.(sin x - sin a)/(x - a) (x→a) 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0时(1-cos(x/2))x / (tan x-sin x) 求极限limx→0 (cosx)^1/sin^2x 求极限：lim x→0 ln[1+sin^2(x)]/[e^(x^2)－1] 求极限limx→0(e^x一1一x)^2/tanx*sin^3x 求极限lim(x→0) sin(1-x)/(1-x^2) 求极限 lim(x→0){x[sin(1/x^2)-1/sin2x]} lim x→0 (x∧2 cscx sin(1/x)) 求极限