`arctan(sqrt(3)/3)` Evaluate the expression without using a calculator.

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Chapter 4, 4.7 - Problem 9 - Precalculus (3rd Edition, Ron Larson).
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loves2learn | (Level 3) Salutatorian

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This question is asking what value of tan will give me `sqrt3/3 ` (`tanx=sqrt3/3 ` ). Using a unit circle, you can determine that the answer is `pi/6 ` .

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