$15.15^{\frac{1}{5}}$
$-402+205$
$2+\tan^2x+\sec^2x=2$
$x2-12x-364$
$\left(5xy^6\right)^4$
$\left(y+9\right)\left(y+4\right)$
$y'\:-xy=\frac{x}{y}$
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