$15x^2-\frac{1}{5}x$
$3ab^2-4ab+b^2+-5ab+6ab^2-3b^2$
$\sqrt{2+1}.\:\sqrt{3}$
$\lim_{x\to\infty}\left(\frac{4x+5}{5x^4+1}\right)$
$3x^4-3x^3-6x^2-3x-9$
$-6ab-5ab-ab$
$2sin\left(x\right)cos\left(x\right)=\tan\left(x\right)$
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