$\left(5m+6n^2\right)^2$
$0,821\cdot4,0$
$+\left(-93\right):\left(-3\right)\cdot\left(-5\right)$
$\left(m^2+2m-1\right)\left(-m^2-2m-1\right)$
$sin^{-1}\left(sin\left(\frac{2\pi}{3}\right)\right)$
$ab+14a^2b^2-15ab+22a^2b+27ab$
$m2-7m-30$
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