Question: Find the derivative of the vector function r(t) = tax (b + tc), where a = (5,-2,-4), b = (1, -5, 1), and c

Find the derivative of the vector function r(t) = tax (b + 

Find the derivative of the vector function r(t) = tax (b + tc), where a = (5,-2,-4), b = (1, -5, 1), and c = (5,5,5). r' (t) = (

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