Find the vectors x and y

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To ask any doubt in Math download Doubtnut: https://goo.gl/s0kUoe • Question: If vec x and vec y are two non-collinear vectors and ABC is a triangle with side lengths a,b and c satisfying (20a-15b)vec x + (15b-12c)vec y + (12c-20a)vec x xx vec y is:

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