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Nothing I just want ur attention ʢ◉ᴥ◉ʡ

Aparticle moves according to a law of motion s = f(t), 0 ≤ t ≤ 12, where t is measured in seconds and s in feet. f(t) = cos(πt/6) (a) find the velocity at time t (in ft/s).

Iwill give brainliest if you answer right : )

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