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I've got this assignment for astronomy class to do:

http://img145.imageshack.us/img145/7500/projoutlinevk1.jpg [Broken]

Basically I'm having a bit of trouble for the part in the image that I highlighted. I can't seem to figure out [tex] \lambda[/tex]. I know what the behavior of the system is supposed to look like for different cases of [tex] \lambda [/tex], I just can't seem to come up with it. Any help would be great!

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# Astronomy/calculus problem

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