Principle Of Mathematical Induction


In triangle ABC, show that

fraction numerator cosA over denominator straight b space cosC space plus space straight c space cosB end fraction plus fraction numerator cosB over denominator straight c space cosA plus straight a space cosC end fraction plus fraction numerator cosC over denominator straight a space cosB plus straight b space cosA end fraction equals fraction numerator straight a squared plus straight b squared plus straight c squared over denominator 2 abc end fraction


Solution not provided.

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