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Math Help - double integral HELP!!!

  1. #1
    Member sluggerbroth's Avatar
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    double integral HELP!!!

    (5) / ( (25-x^(2)-y^(2))^(1/2)) dx dy

    first integral dx goes from (25-y^(2))/2

    second integral dy goes from 5 to zero
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  2. #2
    Member Ruun's Avatar
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    Re: double integral HELP!!!

    Is the integral you're looking for this one?
    \int\frac{5dxdy}{\sqrt{25-(x^2+y^2)}}

    What about polar coordinates? (maybe after rescaling x\to\tilde{x}=\frac{x}{5} and y\to\tilde{y}=\frac{y}{5}
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  3. #3
    Member sluggerbroth's Avatar
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    Re: double integral HELP!!!

    no x in numerator, unless book has misprint
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    Member Ruun's Avatar
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    Re: double integral HELP!!!

    It may be better if you write the equations latex format or state what is the numerator and what the denominator, please
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  5. #5
    Member sluggerbroth's Avatar
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    Re: double integral HELP!!!

    where do i learn latex format?
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  6. #6
    Member sluggerbroth's Avatar
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    Re: double integral HELP!!!

    where are you coming up with math symbols for MHF?
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  7. #7
    Member Ruun's Avatar
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    Re: double integral HELP!!!

    Quote Originally Posted by sluggerbroth View Post
    where are you coming up with math symbols for MHF?
    This is called LaTeX (LaTeX - Wikipedia, the free encyclopedia) and will appear if you embrace latex code between "tex" tag. For instance

    [ tex]\frac{a}{b}[ /tex]

    will produce -removing blank spaces after [-

    \frac{a}{b}
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  8. #8
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    Re: double integral HELP!!!

    Quote Originally Posted by sluggerbroth View Post
    (5) / ( (25-x^(2)-y^(2))^(1/2)) dx dy

    first integral dx goes from (25-y^(2))/2

    second integral dy goes from 5 to zero
    You've done exactly the same thing you did in the other post you did with the same question. You said where the x variables START, but NOT where they end. Until you tell us what both x terminals are, we can't help you much...

    I think Einstein said it best - "Insanity is doing the same thing but expecting a different result".
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