$\frac{d^2}{dx^2}\left(\frac{2}{x^2}\right)$
$\frac{2^{n+1}}{3^n}$
$\lim_{x\to0}\left(\frac{\cos\left(3x\right)-8}{3x^2}\right)$
$\int-15dx$
$-11^3$
$-\int\:\:x\sqrt{1-x^2}dx$
$3x^3-4x^2-x+2$
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