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Which of the following systems of differential equations is
coupled
?
\(\begin{cases} \dfrac{dx}{dt} = 2x \\ \dfrac{dy}{dt} = 5y \end{cases}\)
\(\dfrac{dy}{dt} = 3y^2 - t\)
\(\begin{cases} \dfrac{dx}{dt} = 3x - 2y \\ \dfrac{dy}{dt} = x + 4y \end{cases}\)
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