$x^2-1.6x+0.67$
$\frac{\left(x^3-9x\right)}{9-x^2}$
$12sen^3x\:+\:12\:cosx\:sen^3x\:+\:20\:tan^2\:sen^2x$
$\left(4a+1\right)\left(4a+80\right)$
$3x-5=x+7$
$\frac{dy}{dx}\left(12sin\left(y\right)+2cos\left(2x\right)=13xy\right)$
$\int_6^8\left(3x^5+2x+1\right)dx$
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