Prove the Identity $$\cos ^ { 2 } x - \sin ^ { 2 } x = 1 - 2 \sin ^ { 2 } x$$

question 311

Essay

Prove the identity.
- $$\cos ^ { 2 } x - \sin ^ { 2 } x = 1 - 2 \sin ^ { 2 } x$$

---

Definitions:

Cyberbullying

The use of electronic communication to bully a person, typically by sending messages of an intimidating or threatening nature.

Bullying

Aggressive behavior characterized by repeated or habitual use of force, threat, or coercion to abuse, intimidate, or dominantly impose.

Negative Effects

Outcomes or consequences that are undesirable, harmful, or detrimental in nature, often associated with a particular action or event.

Peer-assisted Learning

A collaborative educational approach where students learn with and from each other, exchanging knowledge and skills.