Question: Can someone please explain to me how they got from the first line to the second line? Cannot understand how this vector derivative was simplified

Can someone please explain to me how they got from the first line to the second line? Cannot understand how this vector derivative was simplified to the final answer... Please explain step by step. T^(')(t)=(1)/(\sqrt(9+16t^(2)))(4j)-(16t)/((9+16t^(2))^((3)/(2)))(3i+4tj)=(12)/((9+16t^(2))^((3)/(2)))(-4ti+3j)

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