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Solução_Calculo_Stewart_6e

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F.<br />

424 ¤ CHAPTER 10 PARAMETRIC EQUATIONS AND POLAR COORDINATES TX.10<br />

7. The curves r =1and r =2represent circles with center<br />

O andradii1and2.Theregionintheplanesatisfying<br />

1 ≤ r ≤ 2 consists of both circles and the shaded region<br />

between them in the figure.<br />

9. The region satisfying 0 ≤ r

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