=> Convex quadrilateral ABCD has AB = 6, BC = 7, CD 9, and DA =...
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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(ZDAB- ZBCD). => 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).