$\left(-3\right)\left(-3\right)\left(-1\right)\left(-1\right)\left(-3\right)\left(-1\right)$
$\left(4x+8x^2\right)^2$
$2-3\cdot\left(5-4\cdot\left(5-2+1\right)\right)$
$\frac{2\cos\left(x\right)}{-\sin^2\left(x\right)}=-2\csc\left(x\right)\cdot\cot\left(x\right)$
$m.\:\left(7m\right)\:+7.\:\left(7+m\right)$
$k-5+3k+6$
$-2m-30m$
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