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Homework Statement
The bessel function Jn(x) is defined by the integral
Jn(x)=1/(inπ)∫0πeixcosφcos(nφ)dφ
From this formula, find the first 3 terms of the asymptotic expansion of Jn(x) when x=n and n is a large positive integer.
Homework Equations
The Attempt at a Solution
I tried combining the cos and exp term together
Jn(x) = ∫-ππ ei(xcosφ+nφ)dφ
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