$-2-\left(-12\right)$
$x^2=20x$
$\lim_{x\to a}\left(\frac{\cos\left(x\right)-\cos\left(a\right)}{\sqrt[6]{\cos\left(x\right)-\sqrt[6]{\cos\left(a\right)}}}\right)$
$-3x\cdot\left(x+7\right)^2+\left(2x-1\right)\cdot\left(-3x+2\right)$
$\left(-tanx\:secx\right)\left(senx\right)$
$\frac{dy}{dx}+y\left(x+7\right)=0$
$10x-4=2x-20$
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