The direction angle ? of a vector is defined as its positive angle relativeto the positive x-axis....

Question

The direction angle ? of a vector is defined as its positive angle relativeto the positive x-axis. Under what conditions, if any, is the direction angle of the sum of thevectors A and B equal to the sum of the two direction angles, i.e., ?A+B = ?A + ?B ?

Robert · Accepted Answer

The direction angle 
The direction angle ? of a vector is defined as its positive angle relative
to the positive x-axis. Under what conditions, if any, is the direction angle of the sum of the
vectors A and B equal to the sum of the two direction angles, i.e., ?A+B = ?A + ?B ?
Ans.

The direction angle ? of a vector is defined as its positive angle relative to the positive x-axis. Under what conditions, if any, is the direction angle of the sum of the vectors A and B equal to the...

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