Prove that the point of A(0,-1) B(-2,3)C(6,7) and D(8,3) are the vertices of the rectangle of ABCD

Prove that the point of A(0,-1) B(-2,3)C(6,7) and D(8,3) are the verti

1.	Prove that the point of A(0,-1) B(-2,3)C(6,7) and D(8,3) are the vertices of the rectangle of ABCD
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