Question: If r ( t ) = t i 3 t j t 2 k and u ( t ) = 4 t i t 2

If r(t)=ti3tjt2k and u(t)=4tit2jt3k, find:
a.[2]ddt[(5t)vec(u)(t)]=
b.[2]ddt[vec(r)(t)*vec(u)(t)]=
If r ( t ) = t i 3 t j t 2 k and u ( t ) = 4 t i

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