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Title: Just a collection of formula and final result.
Review: I bought the fifth edition because someone suggested it as the modern text. I am extremely unsatisfied with it. To understand why - just read the chapters on Sturm Liouville Theory, Special Functions and Fourier Series. Can you imagine discussing Fourier Series without clearly specifying what the Dirichlet conditions are? This book is only a collection of useful formula and final result. Try the old classics like Courant and Hilbert or Morse and Feshbach. If you think these are difficult then try Mary L Boas. This book is not worth your money, not even $10.
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