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If vec a and vec b are vectors such that...

If `vec a` and `vec b` are vectors such that `|vec a + vec b| = |vec a - vec b|`, then the angle between `vec a` and `vec b` is

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 `vec a and vec b`

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The correct Answer is:
A
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