$6\left(13\right)-15$

$\left(x+a\right)\left(x-a\right)\left(x^2-a^2\right)$

$cos\left(x\right)\left(1-sin\left(x\right)\right)\left(1+sin\left(x\right)\right)$

$\lim_{n\to\infty}\left(1+\frac{1}{5n}\right)^{2n+6}$

$\int\left(\frac{10x+9}{\left(20x^2+36x\right)^7}\right)dx$

$\frac{dy}{dx}\:e^{3x}\:cos\:2x$

$11+19p-12+10p$