Half-Angle Formula Flashcards by Matthew Sato

Q

sin(θ/2)

A

+-√[(1-cosθ)/2]

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Q

cos(θ/2)

A

+-√[(1+cosθ)/2]

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Q

tan(θ/2)

A

sinθ/(1+cosθ)
(1-cosθ)/sinθ

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