$\frac{d^{2}y\left(t\right)}{dt^{2}}+2\xi\omega_{n}\frac{dy\left(t\right)}{dt}+\omega_{n}^{2}y\left(t\right)=k\omega_{n}^{2}u\left(t\right)$

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

$x^2-3x+6=\:-3x-7x$

$\left(x^2+5\right)\cdot\left(x^2-5\right)$

$64+r^6$

$3^5-4$

$4x^2-8x-3=0$