Calcolare
limx→0 (ex - 1 - 2x - x2/2 + sin x)/(x sin2 x).
Soluzione
limx→0 (ex - 1 - 2x - x2/2 + sin x)/(x sin2 x) = limx→0 (ex - 1 - 2x - x2/2 + sin x)/x3 (limx→0 x/sin x)2 =
= limx→0 (1 + x + x2/2 + x3/6 + o(x3) - 1 - 2x - x2/2 + x - x3/6 + o(x3))/x3 =
= limx→0 o(x3)/x3 = 0.