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Problem
Problem
Show that the focal chord of parabola
y
2
=
4
a
x
y^2 = 4ax
y
2
=
4
a
x
makes an angle
α
\alpha
α
with the X-axis is of length
4
a
csc
2
α
4a \csc^2 \alpha
4
a
csc
2
α
.
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