1. $\tan 2\theta \tan \theta =1$

• A. $2n\mathrm{\pi }+\frac{\mathrm{\pi }}{3}$
• B. $2n\mathrm{\pi }+\frac{\mathrm{\pi }}{3}$
• C. $2n\mathrm{\pi }+\frac{\mathrm{\pi }}{3}$
• D. $2n\mathrm{\pi }+\frac{\mathrm{\pi }}{3}$

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