Recent content by Shevchenko

Hello Guys I could not simplify the finite product bellow to another expression I hope I get an answer from you guys Thank you

i used cos ax=.(e^ajx + e^-ajx)/2 ,where lambda=a then i put jax=u at the first positive part i got the following integration a/2j int[(e^u)/(a^4-u^2)] respect to u i stopped here : i can't evaluate this integral by parts give me the name of method here only thanks for helping

i don't know about complex contour integration can u show me the solution

show that (don't use Fourier-Transformation method):