$\left(a^2+a+1\right)\left(a^2-a-1\right)$
$2^{3\cdot3\cdot3}$
$cos=-\frac{4}{9}$
$7\sec^2x\left(1-\sin^2x\right)$
$\frac{\frac{\frac{4t^2-16}{8}}{t-2}}{6}$
$y=\left(\sqrt{x}^2\right)\cos\left(\ln\left(\sqrt{2x}\right)\right)$
$x^2+48-19x$
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