`tan^-1 (-sqrt(3)/3)` Evaluate the expression without using a calculator.

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Chapter 4, 4.7 - Problem 18 - Precalculus (3rd Edition, Ron Larson).
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loves2learn | (Level 3) Salutatorian

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You need to find value for which tan equals `-sqrt3/3 ` . Using a unit circle, it can be determined that the answer is `-pi/6 `

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