1. $2{\cos }^{2}x+3\cos x=2 0<\theta <2\mathrm{\pi }$

• A. $\left\{\frac{\pi }{3},\frac{5\pi }{3}\right\}$
• B. $\left\{\frac{\pi }{3},\frac{5\pi }{3}\right\}$
• C. $\left\{\frac{\pi }{3},\frac{5\pi }{3}\right\}$
• D. $\left\{\frac{\pi }{3},\frac{5\pi }{3}\right\}$

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