Hi, Is there any method to find an integral over a line on the upper-plane of x, from –infinity+I*0 to +infinity+I*0 by the form Int(exp(-I*(x-1/x)*theta) /sinh(x-1/x),x=–infinity+I*0.. +infinity+I*0) Or more complicated Int((x^2+x+1)/sinh(x-1/x)*exp(-I*(x-1/x)*theta),x=–infinity+I*0.. +infinity+I*0) Where theta is a constant real number. Cheers Sayed

Hi; Could somebody please let me know about finding functional derivative of H respect to m where, >restart; >H:=int(u(x)^3+u(x)*diff(u(x),x)^2+2*u(x)^2,x=-infinity..infinity); >m:=u(x)-diff(u(x),x$2); by using Maple? Thanks a lot Sayed

Hi, friends. Could you please have a look on this Integral and let me know any suggestion for solving? J:=int(exp(-I*a*x)/cosh(k*x),x=0..theta); where a, k and theta are real constants. cheers Sayed

Hi I work with Maple 9 and I came across to this problem. I don't know where the problem is. >restart: > simplify(convert(sin(1/2*Pi*(-I*x+5)),exp)); > simplify(convert(cosh(1/2*Pi*x),exp)); does it mean that: >sin(1/2*Pi*(-I*x+5))=cosh(1/2*Pi*x); for all x's? Now look at this paradox: >x:=100; > evalf(sin(1/2*Pi*(-I*x+5))); > evalf(cosh(1/2*Pi*x)); where is the problem? cheers Sayed

Hi, guys could you please let me know how I can find this definite integral through Maple? int(exp(-I*x)/cosh(x)^3,x=-infinity..infinity); or int(exp(-I*x)/cosh(x)^2,x=-infinity..infinity); thanks a lot Sayed