Question: Consider the function f(r): = cos ar on the interval [-,] when a is not an integer. (a) Show that (-1)+1 n2 - a?

Consider the function f(r): = cos ar on the interval [-,] when

Consider the function f(r): = cos ar on the interval [-,] when a is not an integer. (a) Show that (-1)"+1 n2 - a? 2a sin an COS (Lr = COS nr 2a2 n=1 for -T

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