$\lim_{x\to infinity}\left(n\:\cdot\:\sin\left(\frac{\pi}{n}\right)\right)$

$0.6^2\cdot0.8^2$

$\cos\left(\frac{\pi}{2}-x\right)\left(\sec\left(\frac{\pi}{2}-x\right)-\cos\left(\frac{\pi}{2}-x\right)\right)$

$\int\frac{1}{x^6\sqrt{\left(4x^2\right)-9}}dx$

$2a^2\cdot5a^3$

$9x^2y^4-16z^2$

$2\frac{dy}{dx}=\sin\left(2x\right)$