$\left(f-g\right)\left(-3\right)$
$\frac{dy}{dx}\cdot y=x$
$\frac{1+cos^2x}{sen^2}=2csc^2x-1$
$87-94-1024$
$\left(\sqrt[5]{x^4}+x^{-3}\right)\left(xy^{-\frac{1}{2}}\right)$
$\left(2x+y\right)^2-\left(x-2y\right)^2$
$x^2-4x+7>0$
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