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If theta is the angle between two vector...

If `theta` is the angle between two vectors `vec a` and `vec b`, then `veca. `b` ge 0` only when

A

`0 lt theta lt (pi)/(2)`

B

`0 le theta le (pi)/(2)`

C

`0 lt theta lt pi`

D

`0 le theta le pi`

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The correct Answer is:
(b)
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