By the Law of Cosines, the distance d between two points (Figure 23) with polar coordinates (r,
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By the Law of Cosines, the distance d between two points (Figure 23) with polar coordinates (r, θ) and (r0, θ0) is
Use this distance formula to show that
is the equation of the circle of radius 9 whose center has polar coordinates (5, π/4).
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