$12a^3b^6-36a^2b^5$
$2cos^2\left(2x\right)-1=cos\left(4x\right)$
$\left(6a+12an\right)$
$-\:x^2+6x-5$
$\left(2-3\right)-\left(-4+1\right)$
$ab+6ab^2-18ba^2+24a^2b^2$
$\left(2^2+3^2\right)$
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