$\frac{d}{dx}\frac{x^2+2x+3}{2x^2-1}$
$\int_1^2\left(\frac{1}{3-5x}\right)dx$
$\left(2a+b\right)^2=\left(2a+2b\right)\left(2a-b\right)$
$\lim_{x\to\infty}\left(\frac{1}{x+8}\right)$
$3x^3-14x^2+7x+4$
$\left(4a-1\right)\left(1+4a\right)$
$-29\cdot4$
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