$8m-12n$
$3.2-7+5\:\left(12-20\right)$
$\frac{1}{csca-cota}=\frac{1+cosa}{sina}$
$-1-5+3x-1$
$\left(\frac{1}{3}x+\frac{2}{3}y\right)^3$
$\left(x+\frac{9}{5}\right)^2$
$x^2+5x+4\ge0$
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