Trigonometry

Double Angle (Cosine)

Cosine of double angle

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LaTeX Code

\cos(2\theta) = \cos^2\theta - \sin^2\theta

Related Formulas

Pythagorean Identity

Fundamental trigonometric identity

Law of Sines

Relationship between sides and angles in triangles

Law of Cosines

Generalization of Pythagorean theorem

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Details

Category
Trigonometry
Formula ID
double-angle-cos
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