Find the angle between`2(hati+hatj)` and `hati`

What is the angle between hati+ hatj and hati-hatj ?

What is the angle between hati+hatj and hati ?

The angle between (hati + hatj) and (hati - hatj) is

If beta is the angle between (hati + hatj) with hati , then beta is

Find the scalar product of the following pairs of vectors and the angle between them. 3hati-4hatj and -2hati+hatj

Find the angle between the vectors hati+hatj and hati-hatj .

Assertion: Angle between hati+hatj and hati is 45^(@) . Reason: hati+hatj is equally inclined to both hati and hatj and the angle between hati and hatj is 90^(@) .

Assertion: Angle between hati+hatj and hati is 45^(@) . Reason: hati+hatj is equally inclined to both hati and hatj and the angle between hati and hatj is 90^(@) .