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If 0 ≤ x < 2π, then the number of the real values of x, which satisfy the equation cos x + cos2x + cos3x + cos4x = 0, is

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If 0 ≤ x < 2π, then the number of the real values of x, which satisfy the equation cos x + cos2x + cos3x + cos4x = 0, is

(A)  9

(B)  3 

(C)  5 

(D)  7

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 Correct  option (D)  7

We have

Therefore, the total number of solutions is 7.

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