Question

3. (x – y)(x + y) + (y – z)(y + z) + (z – x) (z + x) is equal to *

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Answer 1

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Answer 2

Answer:

(x - y)(x + y) + (y - z)(y + z) +(z - x)(z + x)

=x^2-y^2 +Y^2-z^2 +z^2-x^2

=0