$\left(-19\right)-\left(-3\right)$
$54\cdot73$
$x^2+4y^2-16=0$
$2x^2+40x+200$
$z^2-6z-4$
$\lim_{x\to0}\left(\frac{tan\:2\left(x\right)}{x+sen\:x}\right)$
$\left(+12\right)-\left(-7\right)$
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