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It the vectors vec(a), vec(b) and vec(c)...

It the vectors `vec(a), vec(b)` and `vec(c)` form the sides `vec(BC), vec(CA)` and `vec(AB)` respectively of a triangle ABC, then write the value of `vec(a) xx vec(c) + vec(b) xx vec(c)`.

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MODERN PUBLICATION-SAMPLE PAPER 2017-EXERCISE
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