$\left(x-4\right)y'+y=0$
$\cos\left(\frac{x}{3}\right)=-0.7$
$5abc2\:+\:9abc2\:+\:8abc2$
$\frac{y^2}{2}=-\frac{x^2}{2}$
$sin^2tsec^2t=sec^2t-1$
$a-ab;\:a=3;\:b=-2$
$4\left(x+y\right)^2$
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