$x\left(y-z\right)$
$\left(\cot a+1\right)^2$
$\left(\frac{1}{3}a-3\right)$
$y=\frac{2x+3}{x^2-8x+12}$
$\frac{y'}{y}=2$
$\sin^22x\left(\cot^2x-tan^2x\right)$
$3x+1\cdot3^2x+3$
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