Decide Whether the Expression Is or Is Not an Identity $$\sqrt { \sin ^ { 2 } x + \cos ^ { 2 } x } = 1$$

question 421

Multiple Choice

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

• A) Not an identity
• B) Identity

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