$-7\:+\:9\:\cdot\:-3\:+\:1$
$\sqrt[3]{20+\sqrt{49}}$
$3h+15,\:si\:h=1$
$x^2\cdot\left(x^2-2xy+y^2\right)$
$\frac{d^2}{dx^2}\left(-4\sec\left(x\right)\right)$
$x+4-18-3x$
$\frac{cos\left(2t\right)-1}{sin\left(2t\right)}$
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