$y^{\prime}=y^{2}-1$
$\lim_{x\to0}\left(\frac{2^x-5^x}{5^x}\right)$
$\frac{6x^2-4x-3}{x}$
$25a-70a+49$
$16a^2-21a^2+9$
$9b^2-30ab+25a^2$
$9x^2-40x+25$
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