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If 0 ≤ x < 2p, then the number of real values of x, which satisfy the equation cos x + cos 2x + cos 3x + cos 4x = 0 is: [JEE M 2016]
  • a)
    7
  • b)
    9
  • c)
    3
  • d)
    5
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
If 0 ≤ x < 2p, then the number of real values of x, which satisf...
cos x + cos 2x + cos 3x + cos 4x = 0
⇒ 2 cos 2x cos x + 2 cos 3x cos x = 0
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If 0 ≤ x < 2p, then the number of real values of x, which satisfy the equation cos x + cos 2x + cos 3x + cos 4x = 0 is: [JEE M 2016]a)7b)9c)3d)5Correct answer is option 'A'. Can you explain this answer?
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