Question: For any triangle, show that where Use a Half-angle Formula and the Law of Cosines. s(s c) cos 2 ab || (a + b +

For any triangle, show that

s(s – c) cos 2 ab ||


where

(a + b + c).


Use a Half-angle Formula and the Law of Cosines.

s(s c) cos 2 ab || (a + b + c).

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