why my result do not calculate limit value

clc;
clear;
syms x t w X

x=2*exp(-4*t)*cos(10*t);
X=int(x*exp(-j*w*t),t,0,inf)

I want to find X value but its result is always

(2*limit(exp(- 4*t - t*w*1i)*(10*sin(10*t) - cos(10*t)*(4 + w*1i)), t, Inf))/((4 + w*1i)^2 + 100) + (2*(4 + w*1i))/((4 + w*1i)^2 + 100)

how can I calculate that limit value?

[Muhammad Usman]

what's your j and w?

[darova]

Did you try to plot your function to see what can be wrong?