$\frac{2x^3}{6xy}$

$3x+\left(8x^2-3x\right)-\left(-2x+8x^2\right)$

$\frac{\left(\sec\left(x\right)-1\right)^2}{\tan^2\left(x\right)}=\:\frac{\sec\left(x\right)-1}{\sec\left(x\right)+1}$

$\int\frac{3x^2-6x+2}{\left(x^3-3x^2+2x\right)^{\frac{1}{3}}}dx$

$\frac{dy}{dx}=\frac{x}{6y^5}$

$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{sen\:z^2}\right)$

$\left(a^{2}+b^{2}-2ab\right)\left(a+b\right)$