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Math Help - Solving for an angle

  1. #1
    Junior Member
    Joined
    Oct 2008
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    34

    Solving for an angle

    So I seen a problem that said ((a^2-b^2-c^2)/-2bc)=CosA He wants to solve for A but the problem is that in the computer program there is no inverse cos. Is there a way that we are able to solve this problem with out taking the inverse?

    Thanks
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  2. #2
    Senior Member Twig's Avatar
    Joined
    Mar 2008
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    Gothenburg
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    looks very much like the cosine theorem, without using the arccos function Im not really sure what to do :/
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