The equation of a simple harmonic motion is $X = 0.34\cos (3000t + 0.74)$ where $X$ and $t$ are in $mm$ and $sec$. The frequency of motion is
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From given equation $\omega  = 3000,$ 

==> $n = \frac{\omega }{{2\pi }} = \frac{{3000}}{{2\pi }}$

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