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[" The two circles "x^(2)+y^(2)=ax" and ...

[" The two circles "x^(2)+y^(2)=ax" and "x^(2)+y^(2)=c^(2)(c>0)" touch each other if : "],[[" (1) "a=2c," (2) "|a|=2c," (3) "2|a|=c," (4) "|a|=]]

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