$x^2+15x+50$

$\lim_{x\to\infty\:}\left(\frac{14-81^{\frac{489}{x}}}{4}\right)^x$

$\sqrt[6]{a^9}$

$\left(x+5\right)^2+\left(x+3\right)^2-2\left(x+4\right)^2+1$

$\int\frac{x-7}{\left(\left(x-5\right)^2\left(x-9\right)\right)}dx$

$-81\:r\:\:-13r\:-45$

$\frac{x^5y^2}{x^5x}$