If , then the number of real values of that satisfy the equation…

MATHEMATICS · Single correct · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

If 0≤x<2π0\le x<2\pi, then the number of real values of xx that satisfy the equation cos⁡x+cos⁡2x+cos⁡3x+cos⁡4x=0\cos x+\cos2x+\cos3x+\cos4x=0 is (1) 3 (2) 5 (3) 7 (4) 9

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