$a^2-8a-16$
$( x - \sqrt { 2 } ) ^ { 2 }$
$2x^2-32x^2$
$x^2-13x+42=0$
$2424\cdot16$
$\left(-2x^{-1}-y^{-1}\right)^3$
$\frac{d}{dx}7\:\sin\left(x^2\right)$
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