Plot the specified output by using the RK4 method. (3 ddot{x}+dot{x}+x^{3}=frac{4}{3}, x(0)=frac{1}{3}, dot{x}(0)=0,0 leq t leq 20),

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Plot the specified output by using the RK4 method.

\(3 \ddot{x}+\dot{x}+x^{3}=\frac{4}{3}, x(0)=\frac{1}{3}, \dot{x}(0)=0,0 \leq t \leq 20\), output: \(\dot{x}\)

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