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Math Help - Addition of tangent angles

  1. #1
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    Addition of tangent angles

    If x=inv(tan)A and y=inv(tan)B, find tan(A+B) in terms of x and y.

    I cant see how to work this out and think the question should have A and x, and B and y, interchanged.
    The book has the answer (x+y)/(1-xy), which I can get if I interchange the depedent and independent variables.
    Do you think that it's a print error?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by woollybull View Post
    If x=inv(tan)A and y=inv(tan)B, find tan(A+B) in terms of x and y.

    I cant see how to work this out and think the question should have A and x, and B and y, interchanged.
    The book has the answer (x+y)/(1-xy), which I can get if I interchange the depedent and independent variables.
    Do you think that it's a print error?
    you are correct. it is a typo. either you must switch A and x and B and y or change all the inverse tangents to tangents
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  3. #3
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    Thanks for that!
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