If x = 9 is the chord of contact of the hyperbola x2 – y2 = 9, then equation of corresponding of tangents is
9x2 – 8y2 – 18x + 9 = 0
x = 9 is equation of chord of contact of
x2– y2 = 0 …… (1)
(x1, y1) be the point of which x = 9 is chord of contact
w.r.t curve (2) then x x1 – y y1 = 0
pair of tangents through (x1, y1) = (1, 0) is T2 = SS1
9x2 – 8y2 +18x – 9 = 0
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