The equation of a plane standing wave in a homogeneous elastic medium has the form \( \xi=a \cos...

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The equation of a plane standing wave in a homogeneous elastic medium has the form \( \xi=a \cos k x \cdot \cos \omega t \). Plot :
the distribution of density \( \rho(x) \) of the medium at the moments \( t=0 \) and \( t=T / 2 \) in the case of longitudinal oscillations;
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