1.

The locus of the points of intersection of tangents to the hyperbolax^(2) - y^(2) =a^(2) which include an angle of45^(@)is

Answer»

` (X^(2) + y^(2) )^(2) =4A^(2) (x^(2) + y^(2) +a^(2))`
` (x^(2) +y^(2) )^(2) = 4a^(2) (x^(2) -y^(2) +a^(2))`
` (x^(2) +y^(2)) ^(2) =4a^(2) (y^(2) -x^(2) +a^(2))`
` (x^(2) +y^(2) )^(2) =4a^(2) (x^(2) +y^(2) -a^(2))`

ANSWER :C


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