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单词 Quadratic Integral
释义

Quadratic Integral

To compute an integral of the form

(1)

Complete the Square in the Denominator to obtain
(2)

Let . Then define
(3)

where
(4)

is the Negative of the Discriminant. If , then
(5)

Now use Partial Fraction Decomposition,
(6)


(7)

so and . Plugging these in,
(8)
for . Note that this integral is also tabulated in Gradshteyn and Ryzhik (1979, equation 2.172), where it is givenwith a sign flipped.


References

Gradshteyn, I. S. and Ryzhik, I. M. Tables of Integrals, Series, and Products, 5th ed. San Diego, CA: Academic Press, 1979.


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