$\left(a-x\right)\left(a+y\right)$
$\left(5a+7b\right)\left(25a^2-35ab+49b^2\right)$
$x^2+6x+15>0$
$\frac{d}{dx}\left(\frac{\left(x+2\right)^2}{x}\right)$
$3\left(2a\right)+4a-\:3b+5b$
$x^2-5x<0$
$\lim_{n\to\infty}\left(\sqrt{n}\sin\left(\frac{\pi}{\sqrt{n}}\right)\right)$
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