$\left(5x+2\right)\left(3x\right)$
$\:\left(4y^2-y^2\right)+\left(6y^2-9y^2\right)$
$18x^3y^2,12x^2$
$\lim_{x\to2}\left(\frac{\left(x^2+4x-12\right)}{x-2}\right)$
$cos^4+2\left(a\right)+sen^22\left(a\right)=cos^22\left(a\right)+sen^42\left(a\right)$
$\sqrt{\frac{1}{3x}}-\sqrt{\frac{1}{x}+1110}$
$x^2-6+36$
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