Pre-calculus: Double-Angle Identities

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5 Terms

1
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sin2θ = ?

2sinθcosθ

2
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cos2θ = ? (#1)

cos²θ - sin²θ

3
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cos2θ = ? (#2)

2cos²θ - 1

4
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cos2θ = ? (#3)

1-2sin²θ

5
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tan2θ = ?

2tanθ / (1 - tan²θ)