$121a^4\:b^2-\:49\:a^6\:b^8$
$0.25\left(12x-20\right)$
$\left(12x^2-x-6\right)+\left(3x+2\right)$
$2x^2-30$
$3\left(-3-t\right)+8$
$\cos^4\left(x\right)+1-\sin^4\left(x\right)=2\cos^2\left(x\right)$
$m-b+10m-5$
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