$\int-\frac{x}{1+x}dx$
$a^2+16a+64$
$-\left(5x-6\right)+6x$
$\frac{dy}{dx}\left(x^2+y^2=0\right)$
$x^2-x+x+5$
$\frac{d^2}{dx^2}\left(x\cdot\cos\left(x\right)\right)\infty$
$7\:-23\:+15\:-35$
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