$-4ab+0+ab$
$\left(+7\right)-\left(-12\right)+\left(-1\right)$
$\frac{d}{dx}\left(xye^{xy}+\:sen\left(xy\right)\right)$
$x^3+14x^2+49x$
$\int sint\left(cost+5\right)^4dt$
$25x^2-80xy+64y^2$
$\cos\left(\frac{\pi}{2}-x\right)=\frac{2}{7}$
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