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1. It is somewhat a difficult exercise to prove in general that = = 0, but the proof that they are zero for Y (o, o) and Y (1, o) is easy and within the scope of this course. So, please do it! 1/2 1/2 3 Hint: 1 = -ih sing cot & cos d cos O ao Y (0,0) = Y(1,0) =