Question: I seek assistance doing this problem, not sure how to complete it Find the derivative, r'(t), of the vector function. r(t) = at cos 4ti
I seek assistance doing this problem, not sure how to complete it

Find the derivative, r'(t), of the vector function. r(t) = at cos 4ti + b sin5 ti + c c054 tk r'(t) = a(|cos(4t) 4tsi11(4t) )i + (5b sin4t cos t)j + (4c cos3t sin t)k Need Help? i _
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