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Byju's Answer
Standard XII
Mathematics
Pair of Tangents from an External Point
If normal of ...
Question
If normal of circle
x
2
+
y
2
+
6
x
+
8
y
+
9
=
0
intersect the parabola
y
2
=
4
x
at P and Q then find the locus of point of intersection of tangent's at P and Q.
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Solution
y
2
=
4
x
y
y
1
=
2
(
x
+
x
1
)
k
y
=
2
(
x
+
h
)
2
x
−
k
y
+
2
h
=
0
−
6
+
4
k
+
2
k
=
0
2
h
+
4
k
=
6
h
+
2
k
=
3
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Q.
Any ordinate
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