A) 5
B) 7
C) 1
D) zero
Correct Answer: A
Solution :
\[y=\sqrt{a_{1}^{2}+a_{2}^{2}+2{{a}_{1}}{{a}_{2}}\cos ({{\phi }_{2}}-{{\phi }_{1}})}\] \[=\sqrt{16+9+2\times 4\times 3\cos \frac{\pi }{2}}=5\]You need to login to perform this action.
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