`arccos(0)` Evaluate the expression without using a calculator.

Textbook Question

Chapter 4, 4.7 - Problem 8 - Precalculus (3rd Edition, Ron Larson).
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loves2learn | (Level 3) Salutatorian

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Essentially, the question is asking what value of cos gives me 0 (`cosx=0 ` ). Using a unit circle, you can find the answer to be `pi/2 ` .

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