$\csc\left(x\right)^2-6\csc\left(x\right)$
$2x-6=3x-9$
$-x+4,1\le0$
$\sin2x+7\sin x=0$
$2\left(a-b\right)+3c\left(a-b\right)$
$8m^3\left(a^2-b^2\right)+24m^2\left(a^2-b^2\right)$
$12-\left|1-\left(-22+57\right)\right|$
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