If a2 = 0 in Theorem 3.9.4, show that Eq. (3.9.2) becomes
Chapter 3, Problem 20(choose chapter or problem)
If a2 = 0 in Theorem 3.9.4, show that Eq. (3.9.2) becomes the same as Eq. (3.8.1) with a = a1 and f = f1.
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