It is known that a is the unit vector in the plane. If B is multiplied by (a-b) = 0, then the value range of | B | is I believe you are the best | Math enthusiast | Mathematical art

It is known that a is the unit vector in the plane. If B is multiplied by (a-b) = 0, then the value range of | B | is I believe you are the best

If a is the unit vector, then the module is 1
If the angle between vector a and B is a, then | a | * | B | * cosa-b ^ 2 = 0, then | B | = | a | * cosa is deduced
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1. As shown in the figure, △ ABC, D and E are the midpoint of BC and AC respectively. BF bisects ∠ ABC and intersects de at point F. if BC = 6, the length of DF is______ ．
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