find the value of (x-y) (x+y)+(y-z (y+z)?
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(x-y)(x+y)+(y-z)(y+z)
x^2-y^2+y^2-z^2
x^2-z^2
(x+z)(x-z)
x^2-y^2+y^2-z^2
x^2-z^2
(x+z)(x-z)
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