$\left(a\:+5\right)\:\left(a\:-5\right)$

$\tan^2\left(x\right)-\frac{1}{\cos\left(x\right)}=2$

$\int\left(9x^8\cdot\cos\left(x^9+13\right)\right)dx$

$1-\frac{1}{2}\cdot\left(2x-3\sqrt{x}\right)\cdot\left(2x+3\sqrt{x}\right)-2\left(\frac{2}{3}-x\right)$

$y'''+3y''+2y'=0$

$\left(6x+10y\right)dx+\left(10x+4y^2\right)dy=0$

$\:4\:-\:4x\:+\:8y\:-\:4z$