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Pluto's distance $(\text{in billions of kilometers})$ from the sun as a function of time $(\text{in years})$ can be modeled by a sinusoidal expression of the form $.$ At year $t = 0$, Pluto is at its average distance from the sun, which is $D$ billion kilometers. In $T$ years, it is at its closest point to the sun, which is $d$ billion kilometers away. Find $\omega$. $\omega$ should be in radians.