\overrightarrow{f}(t) = (9t, \sin(4t), \cos(5t))\newline What is the speed at time $t = 8\pi$ of a particle whose motion is described by this function?
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\[ \overrightarrow{f}(t) = (9t, \sin(4t), \cos(5t)) \] \[ \overrightarrow{v}(t) = \frac{d}{dt} \overrightarrow{f}(t) = \left( \frac{d}{dt} 9t, \frac{d}{dt} \sin(4t), \frac{d}{dt} \cos(5t) \right) \] Show more…
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