$\frac{dy}{dx}+a\left(x\right)y=0$
$\ln\left(\frac{8}{9x^9y}\right)$
$0.03993-0.9457$
$4x^2-8x-12$
$\frac{\cos^2x-\sin^2x}{\sin x\:+\cos x}=\cos x\:-\:\sin x$
$-18m\left(-18m\right)$
$x^2-10x+90$
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