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## Homework Statement

Two stars of masses M and m, separated by a distance d, revolve in circular orbits around their center of mass.Show that each star has a period given by

T^2= (4π^2)(d^3)/ G(M+m)

## Homework Equations

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## The Attempt at a Solution

I[/B] know the Kepler's Laws can be expressed as T^2= (4π^2)(d^3)/ G(M) but i don't know how it is applied when 2 planets interact with each other (both in circular motion)