Angle between tangent and foci. (Involve vector calculus)

athrun200
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Homework Statement


See the photo on the left


Homework Equations





The Attempt at a Solution


attachment.php?attachmentid=41505&stc=1&d=1322965270.gif
 

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You must show some work of your own or this thread will be deleted.
 
In fact, I type my work on the computer, the photo I have shown is already my work.
That is not solution, that is my attempt to solution. So it may be wrong.
 
Last edited:

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