If \[\cos \theta +\cos 7\theta +\cos 3\theta +\cos 5\theta =0\], then \[\theta \] [Dhanbad Engg. 1972]

If \[\cos \theta +\cos 7\theta +\cos 3\theta +\cos 5\theta =0\], then

1.	If \[\cos \theta +\cos 7\theta +\cos 3\theta +\cos 5\theta =0\], then \[\theta \] [Dhanbad Engg. 1972]
A.	\[\frac{n\pi }{4}\]
B.	\[\frac{n\pi }{2}\]
C.	\[\frac{n\pi }{8}\]
D.	None of these
Answer» D. None of these

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If \[\cos \theta +\cos 7\theta +\cos 3\theta +\cos 5\theta =0\], then \[\theta \] [Dhanbad Engg. 1972]

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