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10 March, 14:00

Simplify the square root of (1-cos theta) (1+cos theta)

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  1. 10 March, 14:21
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    Hello:

    (1-cos (θ)) (1+cos (θ)) = 1-cos² ((θ)

    but : cos² (θ) + sin² (θ) = 1

    1 - cos² (θ) = sin² (θ)

    (1-cos (θ)) (1+cos (θ)) = 1-cos² ((θ) = sin² (θ)
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