$\left(x+9\right)\left(7x-4\right)$

$\frac{d^4y}{dx^2}-2\frac{d^2y}{dx^2}+\frac{dy}{dx}=0$

$2sin^2\left(a\right)=cos\left(a\right)+1$

$\left(2x^4-15x^3-30x^2-20x+42\right)\left(x+9\right)$

$4\:+\:36\::\:9\:-\:50\::\:\left[12\:+\:\left(17\:-\:4\right)\right]$

$\left(3m+n\right)^3$

$2x^2+9x+324$