$2\cdot285$
$\int\:cos^2\:\left(2t\right)\:dt$
$-\left(1+\cot\left(x\right)^2\right)^2$
$j^2+10j+16$
$\left(p+8\right)\:\left(p+9\right)$
$21b+7bc\:$
$\left(xy-11\right)\left(xy+7\right)$
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