CH7 (2) Trigonometry And Modelling Flashcards by Kyle Young | Brainscape

Q

What is the double angle formula for sin2A?

A

2sinAcosA

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Q

What are the double angle formulas for cos2A?

A

Cos²A - sin²A ≡ 2cos²A - 1 ≡ 1 - 2sin²A

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Q

What is the double-angle formula for tan2A?

A

2tanA / 1-tan²A

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