Originally Posted by
Pedro I've tried doing that. Maybe I'am missing something, but I'll get:
Lim [ d/dt(y(t) * e^int{a(t).dt}) ] = 0,
which gives that the integrand is constant,
C = y(t) * e^int{a(t).dt}
How can i reach that "y(t) = 0" when "t-->oo"?