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Homework Statement
Homework Equations
1/r = a/b^{2} * (1+e cosθ)
The Attempt at a Solution
How do you derive 7.27?
I tried to substitute r in the orbit equation by (acosψ  ae) / cosθ and got
(cos ψ  e)/cosθ*(1+e cosθ)=b^2/a^2 I don't know what to do next. Please help, thank you.
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