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6 results for “double angle”

Formulae (6)

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

Double-angle identity for sine.

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

Double-angle identity for cosine.

\tan(2\theta) = \frac{2\tan\theta}{1 - \tan^2\theta}

Double-angle identity for tangent.

\sin 2\theta = 2\sin\theta\cos\theta

Sine of twice an angle.

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

Cosine of twice an angle (also 2cos²θ−1 or 1−2sin²θ).

\tan 2\theta = \frac{2\tan\theta}{1 - \tan^2\theta}

Tangent of twice an angle.