$-12^3y^2-28x^3y^2+7x^3y^2$
$\left|13\right|\:+-2$
$3\left(-\frac{5}{7}\right)^0$
$\lim_{x\to0}\left(\frac{x^2}{x+2}\right)$
$5n=-5+5n$
$y^n=2e^x$
$\frac{1}{cosx+1}+\:\frac{1}{cosx-1}$
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