The solution set of \[(5+4\cos \theta )(2\cos \theta +1)=0\]in the interval \[[0,\,\,2\pi ]\] is [EAMCET 2003]

\[\left\{ \frac{2\pi }{3},\frac{5\pi }{3} \right\}\]

\[\left\{ \frac{\pi }{3},\,\frac{2\pi }{3} \right\}\]

\[\left\{ \frac{\pi }{3},\,\pi \right\}\]

\[\left\{ \frac{2\pi }{3},\frac{4\pi }{3} \right\}\]

The solution set of \[(5+4\cos \theta )(2\cos \theta +1)=0\]in the int

1.	The solution set of \[(5+4\cos \theta )(2\cos \theta +1)=0\]in the interval \[[0,\,\,2\pi ]\] is [EAMCET 2003]
A.	\[\left\{ \frac{\pi }{3},\,\frac{2\pi }{3} \right\}\]
B.	\[\left\{ \frac{\pi }{3},\,\pi \right\}\]
C.	\[\left\{ \frac{2\pi }{3},\frac{4\pi }{3} \right\}\]
D.	\[\left\{ \frac{2\pi }{3},\frac{5\pi }{3} \right\}\]
Answer» D. \[\left\{ \frac{2\pi }{3},\frac{5\pi }{3} \right\}\]

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The solution set of \[(5+4\cos \theta )(2\cos \theta +1)=0\]in the interval \[[0,\,\,2\pi ]\] is [EAMCET 2003]

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