# Calculus: Other Calculus Problems – #27845

Question: Use Maclaurin series to find

a – $$\underset{x\to 0}{\mathop{\lim }}\,\frac{\arctan x-x}{{{x}^{3}}}$$

b – $$\int{\left( \frac{{{e}^{x}}-1}{x} \right)dx}$$