Question: How to solve ODE numerically with periodic boundary condition?

Hi everyone, I am trying to solve an ode like this: diff(y(x),x,x)=-(1+0.2*cos(x))*sinh(y(x))+0.3*cosh(y(x)), the only boundary condition I want to impose is y(0)=y(2*Pi),Dy(0)=Dy(2*Pi). Anybody knows about it? Thanks!
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