$\cot ydx=\tan xdy$
$9n+8n$
$3,74\cdot10$
$2ab\left(x-3\right)-\left(3-x\right)+cd\left(x-3\right)$
$\frac{1}{2}\left(4x-16b+6\right)$
$\left(-a^2y\right)\cdot\left(-axy\right)$
$3x^2-x+1$
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