$2\:\left(4m^5\right)\left(5n^3\right)$
$\frac{1+\cota}{\csca}=\sina+\cosa$
$ycos\left(x\right)\frac{dy}{dx}=e^y\sin\left(2x\right)$
$30\:-\:\left(-20\right)\::\:\left(-4\right)$
$-2e^{-\frac{\infty}{2}}+2e^{-\frac{0}{2}}$
$4\cdot5+4\cdot7$
$2n^2+3n-9$
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