$sec^2\left(x\right)-1=sen^2\left(x\right)$
$\int_0^{\infty}\left(8e^{-2x}\right)dx$
$6\left(2x+1\right)^2$
$y^2-9y$
$a^3b^3x^3+1$
$3-\left(\frac{14}{\left|3-5\right|-9}\right)+\left(-3\right)\cdot\left(-5\right)$
$16-8x+4x^2$
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