In a quadrilateral angle angle b is 90° = angle d. prove that 2 Ac^2-bc^2=ab^2+ bc^2+ cd^2+ad^2

In a quadrilateral angle angle b is 90° = angle d. prove that 2 Ac^2-

1.	In a quadrilateral angle angle b is 90° = angle d. prove that 2 Ac^2-bc^2=ab^2+ bc^2+ cd^2+ad^2
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In a quadrilateral angle angle b is 90° = angle d. prove that 2 Ac^2-bc^2=ab^2+ bc^2+ cd^2+ad^2

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