$\:\:5x\:^2\:\:x\::\:1$
$6.2\left(-8.\right)$
$e^{2x-y}\frac{dy}{dx}=e^{-x}$
$m3+4mn-7m$
$y\left(y'\right)^2+2xy'-y=0$
$\frac{\sin\left(9x\right)-\sin\left(3x\right)}{\cos\left(9x\right)+cos\left(3x\right)}$
$9x\left(4x-5x+3\right)-6x$
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