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The two circles which pass through (0, a) and (0, – a) and touch the line y = mx + c will intersect each other at right angle if
Options :-
- a2 = c2(2m + 1)
- a2 = c2(2 + m2)
- c2 = a2(2 + m2)
- c2 = a2(2m + 1)
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