please help me understand this bit from the book: "Vector Mechanics for Engineers Statics and Dynamics by Beer, Johnston(12th edition)"(page 692).
why or how is ${\it \Delta}e_t = 2\sin(delta\theta/2)$ ?
2026-03-27 14:28:44.1774621724
clarification for the tangential and normal components of acceleration
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I think delta theta as a magnitude can be derived this way.