3. If a bar+ b bar= a bar - b bar prove that the angle between a bar &

1.	3. If a bar+ b bar= a bar - b bar prove that the angle between a bar & b bar is 90°
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3. If a bar+ b bar= a bar - b bar prove that the angle between a bar & b bar is 90°​

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3. If a bar+ b bar= a bar - b bar prove that the angle between a bar & b bar is 90°