Question : If $\displaystyle 2 \theta $ is the angle between the 2 unit vectors $\displaystyle \bar a$ and $\displaystyle \bar b$, then show that $\displaystyle |\bar a - \bar b| = 2 sin \theta$

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Solution:

I know $\displaystyle \bar a - \bar b = |\bar a ||\bar b| cos \theta$

Is dont know what to do afterwards???