Let `veca,vecb` and `vecc` are three vectors such that `|veca|=3, |vec

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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=`
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