- #1
mvillagra
- 22
- 0
Hi, can someone give me a hand with this "little" integral please.
[tex]\int (\cos{k})^{t-s+1}(b-a\sin^2k)^{s/2}e^{-ik(n-1)}dk[/tex]
where
t is the time, which is discrete
s is between 0 and t
k has domain [-pi, pi]
n is a natural number
a, b are complex constants
actually this integral is the binomial expansion of this other integral
[tex]\int (\cos{k}+\sqrt{b-a\sin^2k})^t\cos k \quad e^{-ik(n-1)}dk[/tex]
there are some other constants, which I omitted. Also, I am omitting the coefficients and summation of the binomial expansion in the first integral.
I'm looking for a closed form, and I tried using asymptotic approximations but it doesn't work because in general to solve it using asymptotic techniques you need to write it in this form:
[tex]f(k)e^{\phi(k,t)}[/tex]
and I can't do that. Maybe there are some other asymptotic techniques that I don't know, maybe you can also give me a hand on this.
Thanks in advance!
[tex]\int (\cos{k})^{t-s+1}(b-a\sin^2k)^{s/2}e^{-ik(n-1)}dk[/tex]
where
t is the time, which is discrete
s is between 0 and t
k has domain [-pi, pi]
n is a natural number
a, b are complex constants
actually this integral is the binomial expansion of this other integral
[tex]\int (\cos{k}+\sqrt{b-a\sin^2k})^t\cos k \quad e^{-ik(n-1)}dk[/tex]
there are some other constants, which I omitted. Also, I am omitting the coefficients and summation of the binomial expansion in the first integral.
I'm looking for a closed form, and I tried using asymptotic approximations but it doesn't work because in general to solve it using asymptotic techniques you need to write it in this form:
[tex]f(k)e^{\phi(k,t)}[/tex]
and I can't do that. Maybe there are some other asymptotic techniques that I don't know, maybe you can also give me a hand on this.
Thanks in advance!