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(a-b)x+(a+b) y=a^2-2ab-b^2 and (a+b) (x+y) =a^2+b^2 by substitution method​

Answer 1

Answer:

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The question is to find the value of the determinant and the expression given when a,b,c are coplanar vectors and a is not parallel to b

the first determinant consists of the values as c.a, a.b, c.b and b.b (just in case the question is not visible)