$x^2-3x-9$
$\left(n^2+4n\right)-n^2$
$63=56\left(1+0.004\left(a-20\right)\right)$
$\left(2y\right)\:\cdot\:\left(3z\right)\:$
$-2^5\cdot15$
$-5x-3$
$\frac{d^2}{dx^2}\left(\frac{cos\left(y\right)-xsin\left(y\right)}{2}\right)$
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