Solve the equation

Question:

If $0 \leq x<2 \pi$, then the number of real values of $x$, which satisfy the equation $\cos x+\cos 2 x+\cos 3 x+\cos 4 x=0$, is :-

  1. 9

  2. 3

  3. 5

  4. 7


Correct Option: , 4

Solution:

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