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Caption=2. Using the obtained results and moving ~~    points Î1 ànd Î2, consider following cases ~~    of the mutual position of the circles:~~    - internal tangent;~~    - intersection;~~    - external tangent;~~    - circles do not intersect;~~    - a circle passes through ~~      the centre of another circle.~~3. Prove the obtained result.
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Path=C:\Program Files\DG\DG(ex)\Pogorelov\5_11_2.dgf
