vectors-m

Question: If $\theta$ be the angle between the unit vectors a and b, then $\cos \frac{\theta }{2}=$

1) $\frac{1}{2}\,|\mathbf{a}-\mathbf{b}|$

2) $\frac{1}{2}\,|\mathbf{a}+\mathbf{b}|$

3) $\frac{|\mathbf{a}-\mathbf{b}|}{|\mathbf{a}+\mathbf{b}|}$

4) $\frac{|\mathbf{a}+\mathbf{b}|}{|\mathbf{a}-\mathbf{b}|}$

Solution:

Explanation: No Explanation

Scalar Product Dot Product

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