Figure 1

Dynamics behaviors of system ( 4.1 ) with the initial values \(\pmb{(\varphi(\theta),\psi(\theta))^{T}=(0.6,0.09)^{T}}\) , \(\pmb{(1,0.5)^{T}}\) , and \(\pmb{(1.5,1)^{T}}\) , \(\pmb{\theta\in[-1,0]}\) .