Question

How to solve this vector unit normal from Vector Calculus?:

`r(t)=sqrt(2)ti+e^tj-e^-tk`
`t=0`

Answer 1

answer=`sqrt2`

Explanation:

firstly, differentiate the quantity,
=`sqrt2` + te`j` + te`k`
now, put the value of `t` i.e. 0
`sqrt2` + (0)e`j` + (0)e`k`
on solving further,
=)`sqrt2` is the required answer.