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    brijmohan123456's Avatar
    brijmohan123456 Posts: 41, Reputation: 1
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    #1

    Nov 29, 2012, 07:10 AM
    prove
    In triangle ABC 'a' is the side between B & C,b is the side between A & C and c is the side between A & B. prove that
    a(cosC - cosB)=(b-c)(1+ cosA)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 1, 2012, 10:18 AM
    The trick to this is to use the facts that , and .
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