$\left(-11^2\right)$
$4x^2+24x+477$
$\frac{x^2-81}{x+9}$
$a\cdot a-b\cdot b$
$\frac{dy}{dx}-\frac{4}{x}y=2$
$4x^3\:+\:4x^2\:+\:x$
$x^3\cos\left(\frac{x}{2}+\frac{1}{2}\right)$
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