Verify the Identity $$\cos ( \alpha - \beta ) - \cos ( \alpha + \beta ) = 2 \sin \alpha \sin \beta$$

question 138

Essay

Verify the identity.
- $$\cos ( \alpha - \beta ) - \cos ( \alpha + \beta ) = 2 \sin \alpha \sin \beta$$

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Definitions:

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Information that is hidden or made difficult to understand or access, often intentionally.

Unethical Communication

The practice of spreading misinformation, lying, or using manipulative tactics for personal gain or to harm others, violating moral principles.

Delirium

An acute, often reversible, mental disorder characterized by confused thinking, lack of awareness of the environment, and cognitive disturbances.