$xy'=x-y$
$-y=-4-2x$
$-\left(-12-12\right)$
$\cos^2+\cos^2\cdot\cot^2$
$-11y=22$
$\frac{x+3}{x-3}=\frac{12}{13}$
$\frac{4y^4}{14yx^8}$
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