Question: Use the vector - valued function r ( t ) to find the principal unit normal vector N ( t ) using the alternative formula

Use the vector-valued function r(t) to find the principal unit normal vector N(t) using the alternative formula
N=(v*v)a-(v*a)v||(v*v)a-(v*a)v||
r(t)=7ti4t2j
N(t)=,
Use the vector - valued function r ( t ) to find

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