$\int x\cdot\left(x+2\right)^{-2}dx$
$\frac{4x^2y^9}{12x^2y^4}$
$\lim_{x\to-2}\left(\sqrt{\frac{x^3-8}{x^2+4}}\right)$
$-6a^3b^2c\:\:si\:a\:=-2\:b=3\:d=-4$
$cos\left(-x\right)\cdot sec\left(-x\right)$
$2yz+8y^2-10y-12yz$
$\int\left(e^x\sqrt{81-e^{2x}}\right)dx$
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