$\left(4x^4y^8+x^4y^2\right)^2$
$sen^2x\:+\:cos\:x\:=\:-1$
$3x-5\left(2x-1\right)=5x+17$
$20m-19m$
$\lim_{x\to0}\left(\frac{\tan^2\left(x\right)-x^2}{x^2\tan^2\left(x\right)}\right)$
$\left(4ab-3b\right)^2$
$\left(\frac{10}{2}\right)^2$
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