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Study Stuff for MCA Examinations - NIMCET
Study Stuff for MCA Examinations - NIMCET
Previous Year Question (PYQs)
If $\hat n_1,\hat n_2$ are two unit vectors and $\theta$ is the angle between them, then $\cos\dfrac{\theta}{2}$ is equal to
Solution
$|\hat n_1+\hat n_2|^2=2(1+\cos\theta)$
So,
$|\hat n_1+\hat n_2|=2\cos\dfrac{\theta}{2}$
Hence,
$\cos\dfrac{\theta}{2}=\dfrac12|\hat n_1+\hat n_2|$
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