$\left(8+9i\right)\left(8-9i\right)$
$\frac{x^3-3x^2+0x+11}{x-1}$
$\left(x+19\right)\cdot\left(x-19\right)$
$\lim_{x\to 2}\left(\frac{x^2-x+5}{x-2}\right)$
$\left(8\cdot9\right)\cdot20$
$\frac{d}{dx}2x^2-3xy+y^2=e^{x+y}$
$\frac{4x^7-2x^6+3x}{x+2}$
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