$65m^6n^4-39m^4n^3-13m^2n$
$\left(y^4z^6+4\right)^3$
$1+cot\left(a\right)tan^3\left(a\right)=sec^2\left(a\right)$
$\left(2m^2-n^3\right)\left(2m^2+n^3\right)$
$17\:-\:\left\{5\:-\:3\:+\:\left[8\:-\:\left(-1\:-3\right)\:+\:5\right]\right\}$
$30\cdot30+30-\frac{30}{0}$
$-x^2+6x+7=0$
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