`arccos(1/2)` Evaluate the expression without using a calculator.

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Chapter 4, 4.7 - Problem 7 - Precalculus (3rd Edition, Ron Larson).
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loves2learn | (Level 3) Salutatorian

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You need to find what value of cos gives an answer of 1/2 (`cosx=1/2 ` ). Using a unit circle, one can find the answer to be `pi/3 ` .

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