$\left(-456\right)+45-\left(-123\right)$
$2xdx+\left(1+x^2\right)dy=0$
$5a\cdot5a$
$m ^ { 4 } - 17 m ^ { 2 } + 6 m$
$\left(a^2+5\right)\left(x^2-9\right)$
$\lim_{x\to\infty}\left(-x^2+7x+5\right)$
$\lim_{x\to+\infty}\left(\frac{3^{x-1}}{5^x}\right)$
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