$\csc\left(b\right)+\sin\left(b\right)=\cot\left(b\right)\cdot\cos\left(b\right)$
$5c^4b^2a^2\left(2b-3a^3\right)+30a^3b^4c^2$
$8-2x\le-1$
$3x+5x^2+x\cdot2x$
$\lim_{x\to6}\left(\frac{x^2-4x-21}{x-7}\right)$
$\left(2a-4b\right)\left(6a-15\right)$
$3\:\left(3m^3\right)\left(-2b\right)^2$
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