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  3. convex quadrilateral abcd has ab = 6, bc = 7, cd=

Convex quadrilateral ABCD has AB = 6, BC = 7, CD= 9, and DA 5....

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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(?DAB - ?BCD).

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