$25x^2+100x+10$
$\left(1-5xy^2\right)\cdot\left(1+5xy^2\right)$
$\left(m+2n\right)^2-\left(m-n\right)^2$
$2cos^23x+6cos3x=3$
$2x^2-4x+6$
$x + 3 \leq - x - 7$
$\frac{3x^5-4x^4-7x^2+5x-9}{x-2}$
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