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The two circles x^2+""y^2=""a x and x^2+...

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

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