$\frac{x^5-3x^3-6}{x-1}$

$2\:cos\:x\::\:sen\:x=1$

$-\frac{a^4}{4}-\frac{1}{4}$

$\lim_{x\to0}\left(xsin\left(\frac{9}{x}\right)\right)$

$\frac{dy}{dx}=18x\left(x+2\right)y^{\frac{5}{6}}$

$y=6x+\frac{3}{2x\sqrt{ln\left(x^3\right)}}\left(x-1\right)+3$

$\left(7x-14\right)^3$