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Explanation:
= 4 cos² (t/2) sin (1000 t)
= 2 * 2 cos²(t/2)sin (1000 t)
= 2 * (1 + cos t) sin (1000 t)
= 2 sin (1000 t) + 2 cos t sin (1000 t)
= 2 sin (1000 t) + sin [(1000+1)t] +sin [(1000−1)t]
= 2 sin (1000 t) + sin (1001)t +sin (999)t
= y₁ + y₂ + y₃
Therefore,
Superposition of three waves.
Hope it helps!
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