$\sec0\left(1-\sin^2\right)$
$\left(21x^2-5x-4\right)$
$\left(8m^4-6n^5\right)^2$
$\frac{3-x^4+x^2-2}{x^2+1}$
$7x^3-7x^2+7x$
$2\cdot4+6-2\cdot8-5$
$\left(2x^2+3y^4\right)^2$
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