solve 4 degree partial equation with ode45

vd^2t-wdt+v-w=-v^3-w^2*v-wdt*teta

wd^2t+vdt+v+w=-w^3-v^2*w+vdt*teta

phid^2t+phi=0

tetadt+tetadt*(-w^2+v^2)+(1-teta)*w*wdt+(teta-1)v*vdt=vd^2t*w-wd^2t*v-vdt*wdt

dear all.

my first two equations are non-linear and coupled.The third equation is linear and the last equation is a first-order derivative, nonlinear and coupled.my inputs is time(2second) and boundry condition is:

v(0)=1

vdt(0)=1

w(0)=1

wdt(0)=1

phi(0)=1

phidt(0)=1

my output are v,w,phi,teta and I want to plot output-time diagram.