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OpenStudy (anonymous):
r²=a²-2Racosθ+R² Verify this last expression, plug it into the following equation: dV=(-GMmsinθdθ)/(2r) and integrate from θ=0 to θ=π. (they suggest a change of variables: define u=cos θ) And we should find that the total value of V for the interaction is V=-GMm/R
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