Three sinusoidal waves have the same frequency, \( \mathrm{P} \) bu...

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Three sinusoidal waves have the same frequency,
\( \mathrm{P} \) but their amplitudes are \( a, \frac{a}{2}, \frac{a}{3} \) and their phase

W angles are \( 0, \pi / 2 \) and \( \pi \) respectively. The equation of the resultant wave obtained by the superposition of these three waves is given by \( y=\frac{5}{6} a \sin (k x-w t+\theta) \). Then \( \tan \theta= \)
(1) \( 4 / 3 \)
(2) \( 3 / 4 \)
(3) \( 1 / 3 \)
(4) \( 1 / 4 \)
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