wait. my question has been changed:

Use the Riemann-Lebesgue Lemma to get the asymptotic expansion of :

$\displaystyle I(m)=\int_{a}^{\infty}{f(t)cos(mt)dt} \ \ \ \ as \ \ \ \ m\rightarrow\infty $

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- Nov 18th 2009, 03:23 PMpengchao1024how did u calculate this integral
wait. my question has been changed:

Use the Riemann-Lebesgue Lemma to get the asymptotic expansion of :

$\displaystyle I(m)=\int_{a}^{\infty}{f(t)cos(mt)dt} \ \ \ \ as \ \ \ \ m\rightarrow\infty $ - Nov 18th 2009, 03:26 PMmr fantastic