$x^4+2x^3+x^2-4$
$\int\frac{x}{\left(x^2+3\right)^5}dx$
$2a\left(a^2-5x-3\right)$
$3b^4c-18b^3c^2+27b^2c^3$
$\int_{-1}^x\left(ylnx\right)dy$
$\lim_{x\to+\infty}\left(\frac{1}{3\sqrt{x}}\right)^{\sqrt{x}}$
$\frac{1}{tan\:a}$
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