Sinusoidal Waves: Why Is Textbook Answer 1.5ym?

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Nyasha
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The question and attempt to solution is on the attached image. I don't understand why the answer in the textbook is 1.5ym mine is 1.8 ym
 

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If φ1 = 30o and φ2 = 80o, then φ2 - φ1 is not 30o as you claim in your solution.
 

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