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Let veca,vecb and vecc are three vectors...

Let `veca,vecb` and `vecc` are three vectors such that `|veca|=3, |vecb|=3, |vecc|=2, |veca+vecb+vecc|=4` and `veca` is perpendicular to `vecb,vecc` makes angle `theta` and `phi` with `veca` and `vecb` respectively, then `cos theta+cos theta=`

A

`(3)/(4)`

B

`-(3)/(4)`

C

`(1)/(2)`

D

`-(1)/(2)`

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