$\frac{dy}{dx}+6y=4$

$\int\frac{9}{x^2\sqrt{x^2+3}}dx$

$4-x^2\le-2$

$\left(x+2\right)^2\left(x-3\right)^2\left(x-1\right)^2$

$\frac{a^6-216b^9}{a^2+6b}$

$\lim_{x\to0}\left(\frac{4x\cdot\cos\left(5x\right)-1}{sin\left(3x\right)-3x}\right)$

$\lim_{x\to0}\left(\frac{sinx-x}{x-cosx}\right)$