Introductory Fluid Mechanics L2 p3: Viscosity of a Fluid - Newtonian

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The video is extremely helpful, God bless you! Thank you!

NK-iyif
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Question: Using the small angle approximation you reduced the equation tan(delta theta) = (delta u * delta t)/(delta y) to (d theta)/(dt) = du/dy. How does tan(delta theta) simplify to (d theta) when using the small angle approximation? Where did the tangent function go?

JohnHondo