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If veca,vecb and vecc are unit vectors s...

If `veca,vecb` and `vecc` are unit vectors such that `veca+vecb+vecc=vec0` then angle between `veca` and `vecb` is

A

`(pi)/(2)`

B

`(pi)/(3)`

C

`(2pi)/(3)`

D

`pi`

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