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Level 6

Half-angle formulae


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sin(θ/2)
√ [(1 - cosθ) / 2]
cos(θ/2)
√ [(1 + cosθ) / 2]
tan(θ/2)
√ [(1- cosθ) / (1+ cosθ)]
tan(θ/2)
sinθ / (1+ cosθ)
tan(θ/2)
(1 - cosθ) / sinθ