How can I write a equation include integral in simulink?

Hi I have a equation which contains an integral. I can solve the first and second order differential equation but this is not a differential equation. any idea?

Answer 1

[Babak]

No Pedro it is not that much easy as you said. Let me to write the equation:

L = μ0rl * INTEGRAL(0-->2π)[na(φ, θr) · nb(φ, θr)dφ]