A) a
B) \[\sqrt{2}\,a\]
C) \[\sqrt{3}\,a\]
D) 2a
Correct Answer: C
Solution :
\[A=\sqrt{(a_{1}^{2}+a_{2}^{2}+2{{a}_{1}}{{a}_{2}}\cos \varphi )}\] Putting \[{{a}_{1}}={{a}_{2}}=a\] and \[\varphi =\frac{\pi }{3}\], we get \[A=\sqrt{3}a\]You need to login to perform this action.
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