Se !$ \underset{x\rightarrow \infty }{\lim } {\large{1 \over x- \sqrt{x^2+x}}} !$, !$ B= \underset{x\rightarrow 0 }{\lim }{\large{ \left\vert x^2-2 \right\vert - \left\vert x-2 \right\vert \over x}} !$ e !$ C=\underset{x\rightarrow 0 }{\lim }{\large{ \tan \, 5x \over \tan \, 2x}} !$, então !$ A \cdot B \cdot C !$ e igual a:
