l'hopital's rule

The following inequality is true for all x close to 0. 2 - x²/3 < (x sin x) / (1 - cos x) < 2 What is the value of lim (x sin x) / (1 - cos x) ?

The expression $$\mathop {Lim}\limits_{a \to 0} \,{{{x^a} - 1} \over a}\,\,$$ is equal to