$\int_{0}^{\infty}\frac{1}{2x-1}dx$
$\frac{1}{\left(1-\cos a\right)\left(1+\cos a\right)}$
$+1+7-12+32-15$
$-27-\left(-38\right)$
$12x^6+\:27x^4$
$\left(x+2\right)\left(x+12\right)$
$y\left(2-y\right)$
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