$\left(x+3\right)\left(x-5\right)+\left(x-1\right)^2$
$40\cdot10-3$
$a\left(a-1\right)-3\left(a-1\right)$
$\left(2a-3b+c\right)\left(2a-3b-c\right)$
$\lim_{x\to0}\left(\left(1+5x\right)^{\frac{2}{x}}\right)$
$5ab-4ac$
$y^2=0$
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