$-7f^8-9f^8$

$\lim_{x\to0}\left(\frac{e}{2x}^x\right)$

$\int_0^3\left(\frac{10\pi}{\sqrt{9-x^2}}\right)dx$

$\int\frac{1}{\frac{17}{16}-\frac{cos\left(x\right)}{2}}dx$

$6a^2b-8ab^2-10b^3-12ab^2-6b^3+9$

$\left(ab-8\right)\left(ab-7\right)$

$\int\left(4x^3\sqrt{x^4}+9\right)dx$