$\int\frac{x-2}{x^2-4x}dx$
$5-\left(-8-\left(3-7\right)\right)$
$\frac{dy}{dx}=\frac{cos\:y}{sen\:y}$
$-780+550$
$\frac{m^2-2}{m-7}$
$\int\left(3cos^42x\right)dx$
$32=a^2+4a$
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