MathGroup Archive 2004

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One question about Diracdelta function


hey,Group
    i want to do an integration like
    (N)Integrate[Diracdelta[f[x,y]-a],{x,min.max},{y,min,max}]
    a is a constant number, f[] is a funtion in the form of cos,sin
    It seems impossible to get exact answer by using Intergate command, So
is it possible to get an answer with Numerical Nintegrate?

    another trivial question is: Abs[Exp[ikx]....]^2,
    How can i tell the mathmatica to express it in form of Cos, Sin?

    Thanks a lot
Subi


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