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28 June, 18:31

Suppose a triangle has sides a, b, and c, and let theta be the angle opposite the side length a. If cos theta < a, what must be true?

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  1. 28 June, 19:03
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    Cosine rule: a^2 = b^ 2 + c^ 2 - 2bc cos A

    -> a^2 > b^2 + c^2 - 2bca

    -> abc > (b^2 + c^2 - a^2) / 2
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