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Date: 16-5-2018
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Date: 13-10-2019
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Date: 25-8-2018
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To compute an integral of the form
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(1) |
complete the square in the denominator to obtain
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(2) |
Let . Then define
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(3) |
where
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(4) |
is the negative of the polynomial discriminant. If , then
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(5) |
Now use partial fraction decomposition,
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(6) |
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(7) |
so and
. Plugging these in,
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(8) |
for . Note that this integral is also tabulated in Gradshteyn and Ryzhik (2000, equation 2.172), where it is given with a sign flipped.
REFERENCES:
Gradshteyn, I. S. and Ryzhik, I. M. Tables of Integrals, Series, and Products, 6th ed. San Diego, CA: Academic Press, 2000.
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