Find the sum of `hati` and `hatk` and the angle between the resultant and `hati`.

Explanation

(i) Let `vecA=hati+hatk" "|vecA|=|hati+hatk|=sqrt(1^2+1^2+2.1.1.cos90^(@))`
i.e `|A|=A=sqrt2`
(ii) `prop=tan^(-1)((|k|sin90^(@))/(|hati|+|hatk|cos90^(@)))=tan^(-1)(1)`

`:.prop=45^(@)` w.r.t `hati`