$1-\cos2\left(x\right)+2\sin^2\left(x\right)=2$
$x'=cos\left(x\right)$
$3xy^2+7-2xy^2$
$12m^3n^4\:\:6m^8n^2$
$7a^2bc-14ab^2+21abd$
$q\:x\:3\:x\:r\:x\:2$
$\sqrt{81}-4\:x\:5\:+3^3$
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