$\left(2x-3m\right)\cdot\left(3y+5n\right)$
$x^2-60x-720$
$\:3cosx+3$
$x ^ { 3 } ( \frac { y } { x ^ { 2 } } ) ^ { - 2 }$
$x^5-12x^4-9x^3-48x^2-52x$
$\tan=\frac{3}{2\sqrt{10}}$
$9a^2-30a+5$
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