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Question: note very useful trigonometric identities are these sin a ...

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NOTE: Very useful trigonometric identities are these: sin (A + B)-sin A cos B + sin B cos A, cos(A + B) =cos A cos B-sin A sin B 30. Let f(x) be defined on 0 < x < 6 as follows: Oon 0 < x < 5, and 5 on 5<x<6. Work out (a) its HRS expansion (b) its QRC expansion
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