$14xy\:-\:15\:+\:8\:-\:xy\:-\:6\:-\:9x$

$tan\:\left(t\right)=\frac{3}{tan\left(t\right)}$

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

$3+2\left(2b+4d\right)$

$\frac{16x^2-13x^3+2x^4-9x+20}{x-5}$

$\frac{dy}{dx}=\frac{v}{x}\cdot tan\left(y\right)$

$\lim_{x\to\infty}\left(\frac{\sqrt{1+16\cdot x^6}}{2-x^3}\right)$