Quadrilateral ABCD is inscribed in a circle, and the lengths of its sides are AB = 5, BC = 9, CD = 7, and DA = 3. Let x be the unknown length of diagonal AC. (a)In terms of x, write an expression for cos B. (b)In terms of x, write an expression for cos D. (c)A simple relationship holds between angles B and D. Use it to help you find the unknown length x. (d)Find the length of diagonal BD.

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