$x^2+6x+9=16$
$2x^2y+2x^22+2x^22v$
$n^2-7n+12$
$+3c^{3}\sqrt{x^{2}}\right)$
$\left(10a^2b^4-c^3\right)^4$
$-1+2+2$
$\lim_{x\to0}\left(\frac{-2x}{\cos\left(\pi x\right)\cdot\pi}\right)$
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