EmojiKaomoji

Trigonometry · identities

Cosine Double-Angle Formula Formula

Expresses cosine of twice an angle.

cos 2θ = cos²θ − sin²θ

Variables

θ
angle

Reference details

Subject
Trigonometry
Topic
identities
Plain text
cos 2theta = cos^2 theta - sin^2 theta

Your privacy

Privacy settings

Essential site features work without optional analytics. Optional analytics is currently disabled site-wide and remains off unless both you consent and the owner later enables the verified service.

Essential storage

Used for choices you make on this device, such as theme, favorites, and this privacy preference. It cannot be switched off here.

Always available

This preference panel is not a Google-certified consent management platform and does not authorize advertising. Future advertising in applicable regions requires separate certified CMP configuration.