$49x^2-+4x+1$
$\frac{d}{dx}\left(\frac{\left(2x^3+1\right)e^{x^7}}{x^2}\right)$
$2z=-17.64$
$\lim_{x\to\infty}\left(\frac{x+8}{x+2}\right)^{3x+1}$
$xycscx-xcotx$
$\left(2x^4-7x-6\right)\left(2x+1\right)$
$-\int\:\:x\sqrt{1-x^2}dx$
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