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In any /\ A B C , prove that (b^2-c^2)c...

In any `/_\ A B C ,` prove that `(b^2-c^2)cotA+(c^2-a^2)cotB+(c^a-b^2)cotC=0`

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In any /_\ A B C , prove that (b^2-c^2)cotA+(c^2-a^2)cotB+(c^2-b^2)cotC=0

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