$\frac{sen^2x+tan^2x}{cos^2x-sec^2x}\:\:$
$\left(-\frac{2}{5}x^2y^2\right)\left(-\frac{3}{7}xy\right)\left(\frac{14}{3}x^2y\right)$
$-5x^2+12x+7$
$\int\frac{x^4}{\left(x-2\right)^2\left(x+1\right)^2}dx$
$\frac{1}{\sqrt{x}}\left(1+\sqrt{x}\right)^2$
$0.003x^2-0.6x+40$
$3x+2=26$
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