$\int\:\frac{x+4}{x\left(x^2+4\right)}dx$
$3x^2-27x$
$\left(6x-12\right)\left(6x+9\right)$
$20+90+000000$
$\:\:\:\:\:\:2\left(10\right)+\left(-7\right)$
$\lim_{x\to0.01}\frac{\tan\left(0.01\right)}{\sin\left(0.01\right)}$
$1-4b+4b^2$
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