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(Solved): 1.2 For any two points A and B, prove that AB=BA and that AB=0 if and only if A=B. 1.3 Consider a q ...
1.2 For any two points A and B, prove that AB=BA and that AB=0 if and only if A=B. 1.3 Consider a quadrilateral ABCD inscribed in a circle such that AD?BC. Prove that ?A??B. [6]