$2\log\left(x-2\right)=\log\left(2x-5\right)$
$\frac{dy}{dx}=\frac{1}{\sqrt{x+2}}$
$\sqrt{4-x^2}\cdot\sqrt{x^2-4}$
$\frac{x^{3}+3x}{x^{2}+1}$
$10y^2-11y-6$
$7\left(x-5y\right)+3\left(2x+6y\right)$
$\left(5\cdot r+5\cdot t\right)^2$
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