$\lim_{x\to\infty}\frac{\cos\left(x\right)}{\sin^2\left(0\right)}$
$\frac{\left(2x+1\right)\left(x-1\right)}{x\left(x^2-1\right)}$
$\left(2a+1\right)\left(2a+5\right)$
$\left(-3x-2\right)\left(3x+2\right)$
$\int\frac{\sqrt{7+2tgx}}{cos^2x}dx$
$-125\:\cdot25$
$\left(\frac{5x}{2}+2\right)\left(\frac{5x}{2}-2\right)$
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