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Show that the circles x^(2) +y^(2) + 2ax...

Show that the circles `x^(2) +y^(2) + 2ax + c=0 and x ^(2) + y^(2) + 2by + c=0 ` to touch each other if ` (1)/(a^(2)) + (1)/( b^(2)) = (1)/( c ) `

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