Question:medium

Let $\vec{a}$ and $\vec{b}$ be two unit vectors. If the angle between them is $\theta$, then $\cos(\theta/2) =$

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For unit vectors, remember the standard forms: $|\vec{a}+\vec{b}| = 2\cos(\theta/2)$ and $|\vec{a}-\vec{b}| = 2\sin(\theta/2)$.
Updated On: May 31, 2026
  • $\frac{1}{2}|\vec{a} + \vec{b}|$
  • $\frac{1}{2}|\vec{a} - \vec{b}|$
  • $|\vec{a} + \vec{b}|$
  • $|\vec{a} - \vec{b}|$
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The Correct Option is A

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