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Problem
Problem
The length of normal to the curve
x
=
a
(
θ
+
sin
θ
)
x = a(\theta + \sin \theta)
x
=
a
(
θ
+
sin
θ
)
,
y
=
a
(
1
−
cos
θ
)
y = a(1 - \cos \theta)
y
=
a
(
1
−
cos
θ
)
, at
θ
=
π
2
\theta = \frac{\pi}{2}
θ
=
2
π
is
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