Question:medium

If \(\theta\) be the angle between the unit vectors \(\mathbf{a}\) and \(\mathbf{b}\), then \(\cos \frac{\theta}{2}\) is equal to

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Use \(1 - \cos \theta = 2\sin^2 \frac{\theta}{2}\) for \(|\mathbf{a} - \mathbf{b}|\).
Updated On: Apr 23, 2026
  • \(\frac{1}{2}|\mathbf{a} + \mathbf{b}|\)
  • \(\frac{1}{2}|\mathbf{a} - \mathbf{b}|\)
  • \(|\mathbf{a} + \mathbf{b}|\)
  • \(|\mathbf{a} - \mathbf{b}|\)
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The Correct Option is B

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