A,B,C,D cocyclic prove AC^2=AB×AD+BC^2

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$ABCD$ is a Cyclic quadrilateral,given $BC=CD$

Prove:

$AC^2=AB\times AD+BC^2$
 
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Albert said:
$ABCD$ is a Cyclic quadrilateral,given $BC=CD$

Prove:

$AC^2=AB\times AD+BC^2$
hint:
using the following diagram:
View attachment 6569
 

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