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     EduGorilla 
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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

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    1. a2 = c2(2m + 1)
    2. a2 = c2(2 + m2)
    3. c2 = a2(2 + m2)
    4. c2 = a2(2m + 1)
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Reply To: The two circles which pass through (0, a) and (0, – a) and touch the line y = mx + c will inte….
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