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veca , vecb , vecc are coplanar and vecb...

`veca` , `vecb` , `vecc` are coplanar and `vecb` is `bot` to `vecc` , `veca*vecc=7`
`veca=-hati+hatj+hatk` , `vecb=2hati+hatk` then find `2(veca+vecb+vecc)`

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