EXERCISE 6 Find the general solution of the differential equation y" + 4y' + 4y = x²e-2x, x>0, y = y(x), using the parameter variation method (Lagrange method).

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Q: 10. Suppose that {b} is a sequence such that lim bn = 1. Show that 72-00 bn-1 lim no ln bn 1.

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