The computation of XR(k) for a complex valued x(n) of N points requires _____________

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answerhappygod
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The computation of XR(k) for a complex valued x(n) of N points requires _____________

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a) 2N2 evaluations of trigonometric functions
b) 4N2 real multiplications
c) 4N(N-1) real additions
d) All of the mentioned
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