$\sqrt[4]{16x^2y^8}$

$-\frac{sin\left(x\right)}{sec\left(x\right)}$

$\left(x-13\right)\left(x-4\right)$

$\lim_{x\to+2}\frac{x^2-x+6}{x^2+x-2}$

$9an^2-3an+6a^2n$

$\lim_{x\to-5}\left(\frac{x^2+3x-10}{x+5}\right)$

$\frac{sin^2t}{\cos\left(t\right)}-\sec\left(t\right)-\cos\left(t\right)$