Answer:
.
Squaring both
sides
Diff. w.r.t. x,
again
(1 ? x2)
2y1 y2 + y12 (?2x) = a2
. 2y y1
Dividing both
sides by 1y1, we get
(1 ? x2)
y2 ? xy1 ? a2y = 0
Hence the
result.
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