$\left(3y-3\right)^3$
$x^2sen^2-y^2cos^2+x^2cos^2+y^2sen^2$
$\left(2x+1\right)\left(x+3\right)$
$-9\cdot\left(-27\right)$
$\pi-3\pi a$
$\sqrt[3]{27a^7b^6c^2}$
$a^2\:-\:14a\:+\:49$
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