$\log\left(x\right)+\log\left(x-2\right)=\log\left(2x\right)$
$4\sin^2\left(x\right)-2=2-4\cos^2\left(x\right)$
$\int\frac{x}{\sqrt{x^2\cdot1}}dx$
$\frac{98}{90.9}$
$\frac{dy}{dx}=9.8-y$
$4x^4-864x$
$\left(\frac{2}{5}x^2-10x^3\right)^3$
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