Where do textbook authors get the formula for the position function or the function of a moving particle that are used as examples in solving derivatives? Here are examples:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]s=t^3-6t^2-9t[/tex]

[tex]f(t)=t^2-10t+12[/tex]

I am interested on how to derive these kind of functions. How?

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# Motion of a particle

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