- #1

RadiationX

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[tex]R=\frac{1}{1 + 2cos{\theta}}[/tex]

when [tex]\theta =\pi[/tex] shouldn't [tex]R = -1[/tex]? And not [tex]R= 1[/tex]

Am I over looking some property of the [tex]\cos[/tex] function?

Even when i evalute this expression at [tex]\theta=\pi[/tex]in my ti-89 i get that R is = to 1. What am i not seeing?