\[\int_{a}^{b}e^{ixt}q(t)\,\mathrm{d}t\sim e^{iax}\sum_{s=0}^{\infty}q^{(s)}(a)%
\left(\frac{i}{x}\right)^{s+1}-e^{ibx}\sum_{s=0}^{\infty}q^{(s)}(b)\left(\frac%
{i}{x}\right)^{s+1},\]