$-216y^3+1$
$\left(6a+\frac{7}{4}b\right)^2$
$7-\left(-3\right)+\left(-2\right)$
$\left(10w+2z\right)\left(10w-2z\right)$
$\lim_{x\to3}\left(\frac{x^2+4x-21}{x\:-3}\right)$
$x^2+8x+14$
$x^2sen^2-y^2cos^2+x^2cos^2+y^2sen^2$
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