$sin^2x+cos^2x-b^2$
$2\left(5x^3\right)\left(2x^2\right)$
$\left(2m+5p\right)^3$
$\frac{x^3-1}{x^2}$
$\left(21a^7\right)\left(21a^7\right)$
$\left(a^2-a+b^2\right)\left(a^2+ab+b^2\right)$
$\left(4-x\right)\left(3+2x^2\right)$
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