$2xy\:+\:2x$
$\cos\left(1\right)+\sin\left(1\right).\tan\left(1\right)$
$\frac{dy}{dx}+\frac{2y}{x}=4x$
$\lim_{x\to1}\left(\frac{x^2-1}{x^2+1}\right)$
$-2\cdot\left(-10\right)\cdot\left(-9\right)$
$cos\left(x-\frac{\pi}{2}\right)=senx.$
$8x+4-2x-3$
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