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Math Help - describing the domain and range of an arccos function.....

  1. #1
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    describing the domain and range of an arccos function.....

    ok so the problem is... f(x,y) = arccos(x+y)

    ok im not sure what to do with the x +y stuff but i remember that the arccos(x) has a domain of [-1,1] and the a range of [0,pi]. what i don't know is how to relate that information to this graph. any thoughts hints and or suggestions would be appreciated...

    thanks in advance
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  2. #2
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    i have another question regarding domain and range, this problem is.... f(x,y) = ln(xy-6). because i know that as ln x goes to infinity as x goes to zero, can i say that the inside term.. (xy-6>0)? as the domain? where the range would be all real numbers? would this be true for this problem?
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