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The displacement of two sinusoidal waves...

The displacement of two sinusoidal waves propagating through a string are given by the following equation `y_1 = 4 sin (20 x - 30 t) `, ` y_2 = 4 sin (25 x - 40 t)`.where x and y are in centimeter and t in second
When these two waves interfere , what are the maximum and minimum values of the intensity ?

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