P. 592, lines 11 and 12

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The equation should be

x(t + \Delta t) \approx x(t) + \frac{\Delta t}{2} \left[ \left(-x^3(t) + \sin \left(t x(t) \right) \right) + \left( -\left(x(t) + f(x(t),t) \Delta t \right)^3 + \sin \left( (t + \Delta t)(x(t) + f(x(t),t) \Delta t) \right)  \right)\right]

\qquad = x(t) + \frac{\Delta t}{2} \left[ \left(-x^3(t) + \sin \left(t x(t) \right) \right) + \left( -\left(x(t) + (-x^3(t) + \sin(t x(t))) \Delta t \right)^3 + \sin \left( (t + \Delta t)(x(t) + (-x^3(t) + \sin(t x(t))) \Delta t) \right)  \right)\right]

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