If 0 ≤ x < 2 π, then the number of real values of x, which satisfy the equation
cos x + cos 2x + cos 3x + cos 4x = 0, is :
As we learnt in in
General Solution of Trigonometric Ratios -
- wherein
is the given angle
Thus,
Hence, there are a total number of 7 solutions.
Option 1)
This option is incorrect.
Option 2)
This option is incorrect.
Option 3)
This option is correct.
Option 4)
This option is incorrect.
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