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  4. The number of roots of equation cos x + cos 2x + cos 3x = 0 is (0 le x le 2 π ).

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Q. The number of roots of equation $\cos \, x + \cos \, 2x + \cos \, 3x = 0$ is $(0 \le x \le 2 \pi )$.

BITSATBITSAT 2017

Solution:

Correct answer is (c) 6