Double angle formulae Flashcards by Annie Rose

Q

sin(2A)

A

2sinAcosA

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Q

cos(2A) - both sin and cos

A

cos^2A-sin^2A

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Q

cos(2A) - only cos

A

2cos^2A-1

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Q

cos(2A) - only sin

A

1-2sin^2A

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Q

tan(2A)

A

2tanA/1-tan^2A

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