If \[5\cos 2\theta +2{{\cos }^{2}}\frac{\theta }{2}+1=0,-\pi

1.	If \[5\cos 2\theta +2{{\cos }^{2}}\frac{\theta }{2}+1=0,-\pi <\theta <\pi \], then \[\theta =\] [Roorkee 1984]
A.	\[\frac{\pi }{3}\]
B.	\[\frac{\pi }{3},{{\cos }^{-1}}\frac{3}{5}\]
C.	\[{{\cos }^{-1}}\frac{3}{5}\]
D.	\[\frac{\pi }{3},\pi -{{\cos }^{-1}}\frac{3}{5}\]
Answer» E.

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If \[5\cos 2\theta +2{{\cos }^{2}}\frac{\theta }{2}+1=0,-\pi <\theta <\pi \], then \[\theta =\] [Roorkee 1984]

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