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Which of the following systems of differential equations is
coupled
?
\(\dfrac{dx}{dt} = 3x \)
\(\begin{cases} \dfrac{dx}{dt} = x + y \\ \dfrac{dy}{dt} = x - y \end{cases}\)
\(\begin{cases} \dfrac{dx}{dt} = x \\ \dfrac{dy}{dt} = y \end{cases}\)
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