Double Angle Identities Flashcards by Emily Fordham | Brainscape

Q

sin2A =

A

2sinAcosA

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Q

cos2A =

A

cos^2A - sin^2A
2cos^2A - 1
1 - 2sin^2A

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Q

tan2A =

A

2tanA / 1 - tan^2A

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