The solution set of $(5 + 4\cos \theta )(2\cos \theta + 1) = 0$ in the interval $[0,\,\,2\pi ]$ is
The solution set of $(5 + 4\cos \theta )(2\cos \theta + 1) = 0$ in the interval $[0,\,\,2\pi ]$ is
- 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
$\left\{ {\frac{{2\pi }}{3},\frac{{5\pi }}{3}} \right\}$
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