Typo in elliptical orbit energy derivation?

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Taulant Sholla
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I'm reading through a derivation for the energy of a satellite in an elliptical orbit. Shouldn't EO-2 read as:
c2.PNG

... and not as shown in the following?

c1.PNG
 

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PeroK said:
Looks like a typo to me.
It would depend on what is the angle. Or where. It says it is the polar angle, right?
 

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