If y 1 and y 2 are linearly independent solutions of the associated homogeneous DE for y''

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If y1 and y2 are linearly independent solutions of the associated homogeneous DE for y'' + P(x)y' + Q(x)y = f (x), show in the case of a nonhomogeneous linear second-order DE that (9) reduces to the form of variation of parameters discussed in Section 4.6.

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