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Model Paper 5 — MATHS STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceMATHSModel Paper 51 Mark
Question
If $\vec{a}, \vec{b}$ and $(\vec{a}+\vec{b})$ are all unit vectors and $\theta$ is the angle between $\vec{a}$ and $\vec{b}$, then the value of $\theta$ is:
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Answer

(a) $\frac{2 \pi}{3}$
Explanation: $\frac{2 \pi}{3}$

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