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    orkdork's Avatar
    orkdork Posts: 6, Reputation: 1
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    #1

    Nov 23, 2009, 08:57 PM
    Inverse functions of Trignometric Fuctions?
    2 Arctan x=Arccos 1/2

    My teacher said to use the 1/2 angle formula, but I don't know how to use it :eek:
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Nov 24, 2009, 10:48 AM






    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Nov 24, 2009, 11:06 AM

    If the question was meant to be a proof, and the angle was x/2 for the arccos function, would that be a valid identity?
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