If 0 <= x < 2pi, then the number of real...

If `0 <= x < 2pi`, then the number of real values of x, which satisfy the equation
`cos x + cos 2x + cos 3x + cos 4x = 0`;

A

(a) 5

B

(b) 7

C

(c) 9

D

(d) 3

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The correct Answer is:

B

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