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The differential equation given as dy / dx = y(x^3) - 1.4y, y (0) = 1...

The differential equation given as dy / dx = y(x^3) - 1.4y, y (0) = 1 is calculated by taking the current h = 0.2 at the point x = 0.6 and calculated by the Runge-Kutta method from the 4th degree, find the relative error.
analytical solution: y(x)=e^(0.25(x^4)-1.4x)

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