If two waves represented by $y_1 = 4\, \sin\, \omega t$  and ${y_2} = 3\sin \,\left( {\omega t + \frac{\pi }{3}} \right)$ interfere at a point, then amplitude of the resulting wave will be about
  • A$7$
  • B$6$
  • C$5$
  • D$3.5$
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