simplification of exp



OK, but spendy and pointless(?) (especially %o18)

 (%i11) exp((x+1.5)*%pi*%i);
 (%o11) -%i*%e^(1.0*%i*%pi*x)

 (%i12) exp((x+1.5)*(x + 2.0)*%pi*%i);
 (%o12) %e^(1.0*(%i*%pi*x^2+3.5*%i*%pi*x)+1.0*%i*%pi)

 (%i18) exp((x+1.5)*(x + 3)*(x+5)*%pi*%i);
 (%o18) %i*%e^(1.0*(%i*%pi*x^3+9.5*%i*%pi*x^2+27.0*%i*%pi*x))

--Barton