Given a cyclic quadrilateral ABCD inscribed in a semicircle of diameter CD as shown at the right, with CD = x, and sides of lengths a, b, c, and x, show that . Hint? A GSP file?

Given a cyclic quadrilateral ABCD inscribed in a semicircle of diameter CD as shown at the right, with CD = x, and sides of lengths a, b, c, and x, show that

.

Hint?

A GSP file?

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