Common Data for Questions 23, 24: Let f: R -> R be defined by f(x) = x for - 7 S x S x and f(x+ 27) = f(x). Q.23 The Fourier series of f in [-7, x] is COS MX (A) 3 n (-1)" cos nx + n (-1)" cos nx + w COS MX (D) W m=1 n Q.24 The sum of the absolute values of the Fourier coefficients of f is (A) 72/6 (B) 72/3 (C) 272/ 3 (D) 72