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Problem
Problem
Find the equation of tangent and normal to the curve
x
2
+
y
2
=
a
2
x^2 + y^2 = a^2
x
2
+
y
2
=
a
2
at the point
(
x
1
,
y
1
)
(x_1, y_1)
(
x
1
,
y
1
)
.
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