Question: How would I plot with a domain [a,b)?

To highlight the problem I am haveing let us observe the following example. If we solve the following numerically,

d2/dx2 (s(x)) +s(x) -1=0,

ic: s(0)=1/2,s'(0)=0

How would I go about createing a plot of (s(x),x) for  x a member of [0,2*Pi) (useing polar coordinates clearly)?

The probelm I am haveing is plotting for x a member of [0,2*Pi). I know how to do this for x a member of [0,2*Pi] and (0,2*PI), but not  [0,2*Pi).

Please...help!

 

 

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