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Let y1 and y2 be two solutions of the equation y'' + a(t)y' + b(t)y =...

Let y1 and y2 be two solutions of the equation y'' + a(t)y' + b(t)y = 0 and let W(t) = W(y1, y2)(t) be the Wronskian. Determine an expression for the derivative of the Wronskian with respect to t as a function of the Wronskian itself.

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