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Given that vectors vecA , vecB and vecC...

Given that vectors `vecA , vecB and vecC` from a triangle such that `vecA=vecB + vecC`. Find a, b,c and d such that the area of the triangle is `5sqrt16` where.
`vecA=ahati+bvecj+chatk`
`vecB=dhati+3hatj+4hatk`
`vecC=3hati+hatj-2hatk`

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