$\left(-1\right)\left(-9\right)\:+\:\left(2\right)\left(-7\right)$
$\tan\:\left(\theta\:\right)sen\left(\theta\:\right)=sen^2\left(\theta\:\right)sec\left(\theta\:\right)$
$\:\frac{8m^3-p^3}{2m-p}$
$\left(p^9\right)^7$
$\frac{81m^6-49n^4}{9m^3+7n^2}$
$18\cdot200$
$\left(+2\right)-\left(-3\right)$
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