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If θ is the angle between unit vectors $\large \vec A$ and $\large \vec B$ then $\large \frac{{(1 - \vec A.\vec B)}}{{(1 + \vec A.\vec B)}}$ is equal to

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tan2 ( θ / 2)

sin2 (θ / 2)

cot2 (θ/2)

cos2 (θ/2)

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If θ is the angle between unit vectors and then is equal to

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If θ is the angle between unit vectors $\large \vec A$ and $\large \vec B$ then $\large \frac{{(1 - \vec A.\vec B)}}{{(1 + \vec A.\vec B)}}$ is equal to