Physics/Math
posted by COFFEE .
Given two vectors, a and b, such that a + b = a  b, find the magnitude of b.
Consider the equation
a + b = a  b
to be n vector notation and both a and b have components. Subtract the a vector from both sides. You are left with
b = b
That can only be true if b = 0. That would make its magnitude also zero.
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