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need solution for 15th question

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Option 1 is right. Here is the solution.
$\left( \dfrac {1-\overline {A}\cdot \overline {B}} {1+\overline {A}\cdot \overline {B}}\right) =\dfrac {1-\cos \theta } {1+\cos \theta }=\dfrac {\sin ^{2}\theta / 2} {\cos ^{2}\theta / 2}=Tan^{2}\dfrac {\theta } {2}$
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