If the line ax - by +c =0 is a tangent to xy +1-0 then 1)...

 

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If the line ax - by +c =0 is a tangent to xy +1-0 then 1) ab >0 3) ab = 1 2) ab <0 4) a= 1. b-1 If the line ax - by +c =0 is a tangent to xy +1-0 then 1) ab >0 3) ab = 1 2) ab <0 4) a= 1. b-1