$\left(5j-2k+3s\right)^2$
$\lim_{x\to4}\left(\frac{\sqrt{x^3}-8}{x^{\frac{1}{2}}-2}\right)$
$+3\cdot\left(3+5\cdot5+2\right)$
$\frac{x^3+x}{x^4-1}$
$2a-2b-4a$
$a^2-x^2-a-x$
$\frac{12x^4+7x^2-15}{x^2-2}$
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