Figure 3

Dynamics behaviors of system ( 4.3 ) with initial values \(\pmb{(\varphi(\theta),\psi(\theta))^{T}=(0.05,0.09)^{T}}\) , \(\pmb{(0.13,0.1)^{T}}\) , and \(\pmb{(0.19,0.2)^{T}}\) , \(\pmb{\theta\in[-2,0]}\) .