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The amplitude of a wave represented by displacement equation $y = \frac{1}{{\sqrt a }}\sin \omega t \pm \frac{1}{{\sqrt b }}\cos \omega t$ will be
  • A$\frac{{a + b}}{{ab}}$
  • B$\frac{{\sqrt a + \sqrt b }}{{ab}}$
  • C$\frac{{\sqrt a \pm \sqrt b }}{{ab}}$
  • D$\sqrt {\frac{{a + b}}{{ab}}} $
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