Which of the following is NOT a valid expression for a Fourier coefficient of function f(t) with period 4T? Ⓒao=ff(t)dt be=ff(t) sin(6t)dt a = Which of the following are valid for Fourier coefficients of f(t)= = {1 |t| ≤ 4T 4 < t < 8T 0 with period 16. [Tick all that apply - points will be deducted for wrong answers.] f8dt = □bk=0ak = cos(kt)dt 14m 8T ak = 8x -8m cos()dt Which of the following expressions is NOT equal to zero? ○ 813 of sin(3x) sin(x) dx of sin(3x) cos(x)dx 12m T T □ao 18m f(t) cos(3t) dtao=/ff(t)dt 1 Oak = 4 cos(k)dt * sin(2x) dx Of cos (3x) cos(3x) dx

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