JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

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Analyzing +4 | -1

\cos \,\,x \ne - \frac{1}{2}

, then the solutions of

\cos \,\,x + \cos \,\,2x + \cos \,\,3x = 0

are

View answer and explanation

Correct option: A

2n\pi \,\, \pm \,\,\frac{\pi }{4},\,n \in Z

Option A (

2n\pi \, \pm \, \frac{\pi }{4},\,n \in Z

) is correct because solving the trigonometric equation

\cos x + \cos 2x + \cos 3x = 0

yields this general solution.

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