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सिद्ध कीजिए की वृत्तों x^(2)+y^(2)=1,x^(...

सिद्ध कीजिए की वृत्तों `x^(2)+y^(2)=1,x^(2)+y^(2)-2x-6y=6" तथा "x^(2)+y^(2)-4x-12y-9=0` की त्रिज्याएँ समान्तर श्रेढी में हैं।

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