$\left(2m\:+\:3\right)\left(2m-8\right)$
$\frac{1-sen^2x}{sec^2x}\:$
$m+n+2m+3m$
$3x=x-20\:$
$14\cdot7.50$
$\frac{dy}{dx}\left(x^3ln\left(y\right)=y^2\right)$
$\left(2a+9b\right)^2$
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