The discussion centers around a sign error identified in an exercise answer from a specific book. Laura confirms that her answer, which differs from the author's, is indeed correct due to this sign error. The reference to the exercise can be found in the document linked at "camoo.freeshell.org/22.9.pdf". The consensus is that the author made a mistake, validating Laura's solution.
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Thanks for checking.olgranpappy said:you are right. he has a sign error.