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Trigonometry · identities

Sine Half-Angle Formula Formula

Relates sine of a half-angle to cosine.

sin(θ / 2) = ±√((1 − cos θ) / 2)

Variables

θ
angle

Reference details

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

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