From: Rainer Schöpf <rainer.schoepf@gm...>  20131116 06:58:42

On Fri, 15 Nov 2013 at 19:17 0500, Bard Ermentrout wrote: > Is there any way to differentiate under the integral sign. I'd like to > define a function: > int(exp(a*cos(x)),x,0,pi); > and then get a Taylor series approximation of it in terms of a. > > Reduce does not understand how to differentiate under the integra sign to > get a bunch of simple integrals of powers of cos(x) Differentiation under the integral sign depends on the switch allowdfint which is off by default. See section 7.4.1 of the manual for a description of switches influencing differentiation. Rainer 