$\left(-3b^2f^4\right)\left(2bf^6\right)$
$\int\:\frac{x}{2x-1}dx$
$3\:sen^2x=1$
$\left(2a^2-4ax+2a\right)$
$9+5^3$
$-14x^2+7=0$
$\lim_{x\to2}e^x$
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