What is the dot product of two vectors

What is the dot product of two vectors which are having a magnitude equal to unity and are making an angle of 45°?

A. 0.707 B. -0.707 C. 1.414 D. -1.414

Right choice is A. 0.707

The dot product of two vectors having the angle between them equal to 45° will have the product of the vector’s magnitude. As the vectors are of unit magnitude, their product will be unity. Thus the magnitude factor would be cosine function at 45 °.