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limt = ------------------
x-->a x³ -a³
x² -ax x-a
= ------------------ - ------------------
x³-a³ x³-a³
x(x-a) x-a
= ----------------------- - -------------------------
(x-a)(x²+ax+a²) (x-a)(x²+ax+a²)
x 1
= -------------------------- - -------------------------
x²+ax+a² x²+ax+a²
a 1
= --------------------- - ------------------------
(a)²+a(a)+a² a²+a(a)+a²
a 1
=-------------------- - --------------------
a² +a² +a² a² + a² +a²
a - 1
= --------
3a²