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Question: How to draw phase portrait of an ODE?

Question:How to draw phase portrait of an ODE?

WA573 80 Maple 2020
ode differential-equations phaseportrait plotting
October 09 2022
1

How to draw a phase portrait of (2) same as in the attached figure? I tried it by using dsolve, but couldn't redraw it.  

> 

restart
> 

with(DEtools); with(plots)
> 

alias(phi = phi(xi))

phi

 (1)
> 

eq := (1/2)*m*(diff(phi, xi))^2+`Φ__∓` = h

(1/2)*m*(diff(phi, xi))^2+`Φ__∓` = h

 (2)
> 

NULL
> 

`Φ__∓` = `&-+`(1-cos(phi))

`Φ__∓` = `&-+`(1-cos(phi))

 (3)

``

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