Question

If vector a-vector b = vector a-vector b then angle between a and b

Answer 1

Given that ..

magnitude of A+B vectors =magnitude of A vector=magnitude of B vector=say x.

Let the angle is a.

so ..

lA+Bl^2 = lal^2 + lBl^2 +2|A||Bl cosa

or..

x^2 =x^2 +x^2 +2x^2cosa

or

cos a=-1/2

or

a=120°

hope it help!

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