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Decide Whether the Expression Is or Is Not an Identity 1−cos⁡2x=1−cos⁡x\sqrt { 1 - \cos ^ { 2 } x } = 1 - \cos x

question 120

Multiple Choice

Decide whether the expression is or is not an identity.
- 1−cos⁡2x=1−cos⁡x\sqrt { 1 - \cos ^ { 2 } x } = 1 - \cos x

Definitions:

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