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Mathematics
Mathematics
Problem
Write the equation of the tangent to the circle
x
2
+
y
2
+
2
g
x
+
2
f
y
+
c
=
0
x^{2}+y^{2}+2gx+2fy+c=0
x
2
+
y
2
+
2
g
x
+
2
f
y
+
c
=
0
at a point
(
x
1
,
y
1
)
(x_{1},y_{1})
(
x
1
,
y
1
)
lying on the circle.
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