$-6-\left(-16\right)$

$\left(4x^5+11\right)^2$

$49a^{10n}-\frac{b^{12}}{81}$

$\left(2a^2-4a-7\right)\left(4a^3-2a+5\right)$

$\int\frac{x^2-x+1}{\left(x+4\right)\left(x-3\right)}dx$

$\int\left(\frac{\left(x-x^3\right)}{x^4-2x^2}\right)dx$

$a^2+\left(3-9b\right)a-227b$