$\frac{dx}{dt}=x^2-9$
$2a+3a-5b+4b+7c$
$a^2+2a+3a+a^2$
$\frac{1}{1-\cos\left(x\right)}+\frac{1}{1+cos\left(x\right)}=\frac{2}{sin^2\left(x\right)}$
$\frac{6x+2}{3x^2+2x}$
$y\:+0.32y$
$y'+\frac{x}{x^2+1}y=0$
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