$f\left(x\right)=x^2+2x\left|5.8\right|$
$\lim_{x\to4}\left(\frac{x-3}{\sqrt{x+1}-2}\right)$
$\frac{sen^2x\cdot cos^2x+sen\:x}{1-sen^2x}$
$\int sec\left(2t\right)tan\:\left(2t\right)dt$
$3y-4y^2+3y$
$x^2-4x^2-21$
$3\tan\left(2x\right)=\sqrt{3}$
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