Prove that A ∩ (B-A) = θ
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The line joining the point of intersection of two direct tangents with centres of circles bisect the angle.
In △OO
1
A,
sin
2
θ
=
O
1
O
O
1
A
=
a+b
a−b
2
θ
=sin
−1
[
a+b
a−b
]
θ=2sin −1
[a+b a−b]
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