$\left(\sqrt{9x+19}-6x-1\right)\left(\sqrt{9x+19}+6x+1\right)$

$\frac{dx}{dt}=8-\frac{2x}{25}$

$\left(x-11\right)\left(x+6\right)$

$\int\left(x+2\right)\left(x+3\right)dx$

$\int\frac{2x-9}{\sqrt{x^2-9x+1}}dx$

$\sqrt[16]{24\left(5^2+1\right)\left(5^4+1\right)\left(5^{16}+1\right)+1}$

$x^6+4x^4$