Why Does Maple Return Symbolic Answers When Integrating Functions?

[kubekas]

Hi every body

I am trying to intergrate the following function using Maple:

j2out(x):=c2*x*exp(int((s-vout(s))/s/vout(s),s=0.0015..x));

where vout(s)=0.07595560773650. C2 is constant

but when I do, it returns a symbolic answers i.e Maple just returns the original expression without doing any thing even if I try evalf.

Any suggestion out there?
Amos

 

[g_edgar]

c2*x*exp(int((s-vout(s))/s/vout(s),s=0.0015..x));

$${\it c2}\,x{{\rm e}^{\int _{ 0.0015}^{x}\!{\frac {s-{\it vout} \left( <br /> s \right) }{s{\it vout} \left( s \right) }}{ds}}}$$

subs({vout(s)=0.07595560773650, c2=2.3456, x=1.92},%);

$$4.503552\,{{\rm e}^{\int _{ 0.0015}^{ 1.92}\! 13.16558487\,{\frac {s-<br /> 0.07595560773650}{s}}{ds}}}$$

evalf(%);

$$3.279676846\;10^8$$