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Two vectors vec(a) and vec(b) are such ...

Two vectors `vec(a) and vec(b) ` are such that `|vec(a)| = 2 , |vec(b)| = 1 ` and `vec(a) . vec(b) = 1 , ` then find the value of `(3 vec(a) - 5 vec(b)).(2 vec(a) + 7vec(b))`

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