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  1. Top | #1

    Feb 2011
    3
    0.47
    - 07808582723
    2,621
    Thanked: 719
    arc ??????

  2. Top | #2

    Feb 2011
    2
    1.65
    07701766668 / 07800055259
    9,136
    Thanked: 7430
    arc

    : cos 60 = 0.5 : arccos (0.5) = 60

: 1 (0 1 )


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