\begin{flalign} &(a) \quad \lim_{x\to0} \frac{\sin(x)}{x} && \\ &(b) \quad \int_0^{\infty} e^{-x}\ln(x) dx \\ &I = \int_{a}^{b} \text{ 7.50 } x^3 + 5x^2 - \text{ 7.50 } x \, dx& \end{flalign}