$144h^2-49i^2$
$4+\sqrt{2x}$
$a-a+3a$
$\int-5x\cos\left(x\right)dx$
$\lim_{x\to+infity}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$124+643$
$\left(5n+8b\right)\left(5n-8b\right)$
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