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

$\left(-4x^6+5y^4\right)\left(-4x^6-5y^4\right)$

$\frac{\left(-942+128x^2-31x+12x^3\right)}{\left(x+4\right)\left(x+6\right)\left(x-3\right)-\left(x-3\right)}$

$\int\frac{e^x+e^{2x}+e^{3x}}{e^{4x}}dx$

$-n+4-9-5n$

$256^{12}\:-\:144$

$\int\frac{3x-9}{x^2-2x-15}dx$