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The two circles which pass through `(0,a)a n d(0,-a)` and touch the line `y=m x+c` will intersect each other at right angle if `a^2=c^2(2m+1)` `a^2=c^2(2+m^2)` `c^2=a^2(2+m^2)` (d) `c^2=a^2(2m+1)`

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