$\frac{1-\cos\left(4x\right)}{x\sin\left(5x\right)}$
$\left(x+1\right)\left(x-3\right)\le\:0$
$\int\frac{5x-4}{6x-x^2-x^3}dx$
$\frac{dy}{dx}=\frac{1}{10}\cdot\cos\left(\sqrt{y}\right)^2$
$81a^2+54ab+9b^2$
$\int\left(x^2+14x\right)\left(x^3+7x^2+1\right)dx$
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