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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 

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Correct Option :- (C) depends on B, D but independent of A, C, E

Explanation :-

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