Let f (x) = cos 5x + A cos 4x + B cos 3x + C cos 2x + D cos x + E, and
T = f (0) - f(π/5)+f(2π/5)-f(3π/5)+....+f(8π/5)-f(9π/5). Than T
(A) depends on A, B, C, D, E
(B) depends on A, C, E but independent of B and D
(C) depends on B, D but independent of A, C, E
(D) is independent of A, B, C, D, E