$\left(-12\right)-\left(-3\right)+\left(-5\right)$
$\left(x-3\right)^2-2<x+7$
$x\cdot\frac{dy}{dx}+3y=\frac{1}{x}$
$\cos2x=1-2\sin^{2}x$
$\lim_{x\to-2}\left(x^3-5x^2+1\right)$
$\int\left(\frac{3}{7x}\right)dx$
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