$\int\tan\left(\frac{x}{2}\right)^2dx$

$2x^2-3x-6x-2x^2$

$-6\cdot6\cdot6\cdot n^3\cdot n^3\cdot n^3\cdot b^4\cdot b^4\cdot b^4$

$\lim_{x\to1}\left(\frac{sin\left(3x-3\right)}{x-1}\right)$

$\frac{3a^3x+9b^{3y}}{3b^y+\sqrt[3]{3a^2}x}$

$\frac{dy}{ds}=\frac{s^2}{y^2}$

$\frac{dy}{dt}=ty\left(3-y\right)$