1.

If abs(vec v_1+vec v_2)=abs(vec v_1- vec v_2) and vec v_2 is finite thus

Answer»

`vec v_1` is PARALLEL to `vec v_2`
`vec v_1` is `bot` ER to `vec v_2`
`ABS (vec v_1)=abs (vec v_2)` and `vec v_1=vec v_2`

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