In thin airfoil theory applied for cambered airfoils, a Fourier cosine series expansion is used to represent the slope of the mean camber line. In general, The Fourier cosine series representation of a function f(O) over an interval 0 = 0 st is given by: f(0) = K + K, cosno) 1-1 Why are all coefficients greater than n 2 3 = 0