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For non - zero vectors vec(a) and vec(b)...

For non - zero vectors `vec(a)` and `vec(b)` id `|vec(a)+vec(b)|lt|vec(a)-vec(b)|`, then `vec(a)` and `vec(b)` are

A

collinear

B

perpendicular to each other

C

inclined at an acute angle

D

inclined at an obtuse angle

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