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Problem
Problem
Prove that the area of the triangle formed by the tangents drawn from
(
x
1
,
y
1
)
(x_1, y_1)
(
x
1
,
y
1
)
to
y
2
=
4
a
x
y^2 = 4ax
y
2
=
4
a
x
and their chord of contact is
(
y
1
2
−
4
a
x
1
)
3
/
2
/
2
a
(y_1^2 - 4ax_1)^{3/2} / 2a
(
y
1
2
−
4
a
x
1
)
3/2
/2
a
.
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