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Convex quadrilateral ABCD has AB = 6, BC = 7, CD = 9, and DA = 5. The area of quadrilatearl of ABCD is

Convex quadrilateral ABCD has AB = 6, BC = 7, CD = 9, and DA = 5. The area of quadrilatearl of ABCD is 30. Determine the exact value of cos(ZDAB- ZBCD).

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