- #1

utkarshakash

Gold Member

- 854

- 13

## Homework Statement

The vector -i+j+k bisects the angle between the vector c and 3i+4j. Determine a unit vector along c.

## Homework Equations

## The Attempt at a Solution

Taking the dot product of the two vectors (other than c) gives me the cosine of the angle = 1/5√3.

This is also equal to the angle between the angle bisector and c. But now I can't take the dot product anymore as I don't know anything about c.