I was watching a lecture in which the professor derived the Navier Stokes Equations for const density and viscosity. He however skipped a step and directly went from one equation to another without giving any explanation. I have attached an image file in which the 2nd equation is derived from the first equation. Can anyone please explain how this came to be?(adsbygoogle = window.adsbygoogle || []).push({});

I apologize in advance for uploading a handwritten equation.

oh 'I' in the image below is the identity matrix

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# Navier Stokes Eqn for const. density and viscosity

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