$6a^2+12a$
$\frac{200}{25}$
$\frac{b^6-2b}{b-5}$
$\frac{1}{1-sena}+\frac{1}{1+sena}=2sec^2a$
$a2-4$
$x^3-4x^2-2x+8$
$\frac{x^7\left(x-6\right)^3}{\left(x^2+2\right)^6}$
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