Monday, 8 May 2017

calculus - Question about steps/derivation regarding Laplace method.

I am reading something on the Laplace method of integrals and I don't understand part of it's argument. It gives the integral
43eλx2log(1+x2)dx


and finding the leading term of asymptotics for λ. It first argues



"Since only small |x|, such that |x|1λ1 are important,




log(1+x2)x2



I(λ)43eλx2x2dxeλx2x2dx20eλx2x2dx."



I'm really not following that argument at all. Any help would be appreciated.

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