`cos(arccos(-0.1))` Use the properties of inverse trigonometric functions to evaluate the expression.

Textbook Question

Chapter 4, 4.7 - Problem 49 - Precalculus (3rd Edition, Ron Larson).
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loves2learn | (Level 3) Salutatorian

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cos and arccos cancel.

This leaves the answer to be `-0.1 `

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