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Trigonometry · identities

Cosine Half-Angle Formula Formula

Relates cosine of a half-angle to cosine.

cos(θ / 2) = ±√((1 + cos θ) / 2)

Variables

θ
angle

Reference details

Subject
Trigonometry
Topic
identities
Plain text
cos(theta/2)=+/-sqrt((1+cos theta)/2)

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