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One of the diagonals of parallelogram AB...

One of the diagonals of parallelogram ABCD with `veca` and `vecb` as adjacent sides is `veca+vecb`. The other diagonal `vec(BD)` is

A

`veca-vecb`

B

`vecb-veca`

C

`veca+vecb`

D

`(veca+vecb)/(2)`

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