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    sanmaestro's Avatar
    sanmaestro Posts: 3, Reputation: 1
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    #1

    Dec 9, 2010, 05:48 AM
    prove: cos^A/2 cos^2B/2 cos^2C/2=2 2sinA/2*sinB/2*sinC/2
    Solve it ***!
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Dec 9, 2010, 07:00 AM

    If this is what you are trying to prove:



    I don't see how they are equivalent...

    cos is always less than 1. Hence, the left hand side is less than 1.

    On the right hand side, you have 2 + 2sin sin sin

    sin is less than 1, and twice that isn't much... the '2' in front of everything makes it too much.
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