Double Angle Identities Flashcards by Diego Gryth

Q

What is sin(2θ)?

A

2 sin(θ) cos(θ)

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Q

What is cos(2θ)?

A

cos²(θ) - sin²(θ)
= 2 cos²(θ) - 1
= 1 - 2 sin²(θ)

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Q

What is tan(2θ)?

A

(2 tan(θ)) / (1 - tan²(θ))

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