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The computation of XR(k) for a complex valued x(n) of N points requires: 
  • a)
    2N2 evaluations of trigonometric functions
  • b)
    4N2 real multiplications
  • c)
    4N(N-1) real additions
  • d)
    All of the mentioned
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The computation of XR(k) for a complex valued x(n) of N points require...
Explanation: The expression for XR(k) is given as
So, from the equation we can tell that the computation of XR(k) requires 2N2 evaluations of trigonometric functions, 4N2 real multiplications and 4N(N-1) real additions.
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The computation of XR(k) for a complex valued x(n) of N points requires:a)2N2evaluations of trigonometric functionsb)4N2real multiplicationsc)4N(N-1) real additionsd)All of the mentionedCorrect answer is option 'D'. Can you explain this answer?
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