$\left(3m+7\right)\left(3m+6\right)$
$4a^2b-5ab^2+a^2b-ab^2$
$\sqrt{2}+2\sqrt{2}+3\sqrt{2}$
$m+50=-45$
$\csc2x=\cot x-\cot2x$
$-9\cdot30$
$3x^3-x^2\cdot\left(-2x\right)$
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