$\left(-2\right)^2-\:\left(-3\right)$
$\frac{x^2-5x}{x+1}.\frac{x+1}{x^2+3x}$
$-2\cdot2x$
$\lim_{x\to0}\left(\frac{7+7x+3x^2-7e^x}{1-\cos\left(x\right)}\right)$
$\frac{d}{dx}-csc3x-sin3x$
$-6+1-\left(-2\right)$
$4+\left(-7+\left(3+2\right)-\left(-2\right)+\left(-3\right)-\left(+8-8\right)\right)+\left(-10\right)+10-3$
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