Which of the following expressions is always equal to ?

MATHEMATICS · Single correct · CBSE · Mathematics · Polynomials · Polynomials

Problem

Which of the following expressions is always equal to 4xy4xy? (a) (x+y)2+(x−y)2(x+y)^2 + (x-y)^2 (b) (x−y)2−(x+y)2(x-y)^2 - (x+y)^2 (c) (x+y)2−(x−y)2(x+y)^2 - (x-y)^2 (d) (x+y)(x−y)(x+y)(x-y)

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