Prove that in any triangle ABC(i) `c^2 = a^2 + b^2-2ab cos C` (ii) `c=bcosA+acosB`

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Prove that in any triangle ABC(i) `c^2 = a^2 + b^2-2ab cos C` (ii) `c=bcosA+acosB` Prove that in any triangle ABC(i) `c^2 = a^2 + b^2-2ab cos C` (ii) `c=bcosA+acosB`
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