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If |vec(a) + vec(b)| = |vec(a) - vec(b)|...

If `|vec(a) + vec(b)| = |vec(a) - vec(b)|` then

A

`vec(a)` and `vec(b)` are perpendicular

B

`vec(a)` and `vec(b)` are parallel

C

`|vec(a)| = |vec(b)|`

D

there is no relationship between a and b

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The correct Answer is:
A
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