In 19 and 20, investigate whether x = 0 is an ordinary point, singular point, or
Chapter 5, Problem 19(choose chapter or problem)
In 19 and 20, investigate whether x = 0 is an ordinary point, singular point, or irregular singular point of the given differential equation. [Hint: Recall the Maclaurin series for cos x and e".]xy" + (1 - cos x)y' + i1y = 0
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