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If 0 ≤ x <2π, then the number of real values of x, which satisfy the equation cos x + cos 2x + cos 3x +cos 4x =0, is (a) 3 (b) 5 (c) 7 (d) 9

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If 0 ≤ x <2π, then the number of real values of x, which satisfy the equation

cos x + cos 2x + cos 3x +cos 4x =0, is

(a) 3

(b) 5

(c) 7

(d) 9

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Best answer

The correct option is (c) 7

Explanation:

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