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

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Calculus

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

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