$31-\left(-11\right)$
$24x^2-54x$
$( m + 2 ) ^ { 3 } ( m - 2 ) ^ { 3 }$
$\cos\left(1.37\right)$
$a^5+9a^3$
$\lim_{x\to2a}\left(\frac{x-2}{\sqrt{x}-\sqrt{2}}\right)^x$
$- ( \frac { 1 } { 2 } x + 4 ) ^ { 2 }$
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