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An annular sector with a central angle of 6 e (0, 2n) and radii of 1 and r > 1 has a perimeter of 8.

An annular sector with a central angle of 6 e (0, 2n) and radii of 1 and r > 1 has a perimeter of 8. Determine the values of r and B such that the area of the annular sector is maximised, and the value of this maximal area. Verify the area is maximal using the Second Derivative Test

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