Prove that (x-y)(x+y)+(y-z)(y+z)+(z-x)(z+x)=0
pls pls pls pls pls answer this question.....
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Prove that (x-y)(x+y)+(y-z)(y+z)+(z-x)(z+x)=0
pls pls pls pls pls answer this question.....
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