\text { Q1. Consider two vectors } A=\left(\begin{array}{l} 2 \\ 1 \\ 0 \end{array}\right) \text { and } B=\left(\begin{array}{c} -1 \\ 2 \\ 0 \end{array}\right) \text { . } (a)

What is the unit vector which is in the same direction with vector A? (b) What is the dot product of A and B? (c) What is the angle between these two vectors?