A) \[0\le \theta \le \pi \]
B) \[\frac{\pi }{2}\le \theta \le \pi \]
C) \[0\le \theta \le \frac{\pi }{2}\]
D) None of these
Correct Answer: C
Solution :
As we know \[\mathbf{a}\,.\,\mathbf{b}=ab\cos \theta \] Obviously, \[\cos \theta \,\ge 0\] for \[0\le \,\theta \,\,\le \frac{\pi }{2}\] and \[\frac{3\pi }{2}\le \,\theta \,\le 2\pi .\]
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