double angle formulars

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4 Terms

1
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All 3 Pythagorean Trig Identities

\cos^2\theta + \sin^2\theta = 1 \sec^2\theta - \tan^2\theta = 1 \csc^2\theta - \cot^2\theta = 1

2
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Double-Angle Formulas for \cos 2\theta

\cos^2\theta - \sin^2\theta 2\cos^2\theta - 1 1 - 2\sin^2\theta

3
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Double-Angle Formula for \sin 2\theta

2\sin\theta\cos\theta

4
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