$\frac{x^6-27^3}{x^2-3y}$

$\int\left(z^2\right)dz$

$\lim_{x\to0}\left(\frac{15x^4ln\left(x\right)-x^{14}}{ln^2x}\right)$

$\int\left(x^3\right)\left(sqrt\left(1+x^2\right)\right)dx$

$\sin\left(2\theta\:\right)=\cos\left(\theta\:\right)$

$\lim_{x\to2}\left(\frac{x^2-2}{x^2-x-2}\right)$

$\cos x=\cos\left(60-x\right)$