If \( \hat{a} \) and \( \hat{b} \) are unit vectors inclined at an ...
If \( \hat{a} \) and \( \hat{b} \) are unit vectors inclined at an angle \( \theta \) then prove that:
\( P \)
\[
\cos \frac{\theta}{2}=\frac{1}{2}|\hat{a}+\hat{b}|
\]
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