$6a.\ \int_{}^{}{e^{\text{ax}}dx = \frac{1}{a}e^{\text{ax}} + C}$

$7a.\ \int_{}^{}{\sin{axdx = - \frac{1}{a}\cos{ax + C}}}$

$8a.\ \int_{}^{}{\cos{axdx = \frac{1}{a}\sin{ax + C}}}$