Problems and Solutions #091

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다음 값을 구하여라.

  1. $\tan(20^{\circ}) \tan(40^{\circ}) \tan(80^{\circ})$.
  2. $\tan(20^{\circ}) - \tan(40^{\circ}) + \tan(80^{\circ})$.
  3. $\tan^2(20^{\circ}) + \tan(40^{\circ})^2 + \tan^2(80^{\circ})$.

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