Two vectors 2a+b and a-3b are perpendicular. Find the angle between a and b if |a|=2|b|
I will type the question again directly from my textbook without checking the question above.
Two vectors 2a+b and a-3b are perpendicular. Find the angle between a and b, if |a|=2|b|.
Their answer: 60 degrees.
They want the angle between vector a and b, not vectors 2a+b and a-3b.