Angle between the vectors $(\hat i + \hat j)$ and $(\hat i - \hat k)$ is ........ $^o$
$90$
$0$
$180$
$60$
Angle between the vectors $(\hat i + \hat j)$ and $(\hat i - \hat k)$ is ........ $^o$
$\cos \theta = \frac{{\vec A.\vec B}}{{|\vec A||\vec B|}} = \frac{1}{{\sqrt 2 \sqrt 2 }} = \frac{1}{2}$ $\theta = 60^\circ $
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