(f(t) = Cos(pi(t)/4) , T
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(f(t) = cos(pi(t)/4) , t<=10) Find the velocity at time t. |
Answer No.1
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F'(t) = -(pi/4)Sin(pi(t)/4) |   |
Answer No.2
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= - sin (pi/4 t) * 4/pi | |
Answer No.3
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F'(t) = - π/4 sin πt/4 | |