Velocity of a sinussodial function

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Homework Statement

A sinusoidal function of time is
x = (4.7 m) cos[(0.2 rad/s)(4.5 s)] .
Find the magnitude of the velocity v.



Homework Equations





The Attempt at a Solution

HELP! :)
 
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What's the "4.5 s" parameter in the cosine function? Shouldn't there be a 't' variable in there if the position is a function of time?