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IF x+y+z=0 then what is (xyz)/((x+y)(y+z...

IF `x+y+z=0` then what is `(xyz)/((x+y)(y+z)(z+x))` equal to

A

`-1 `

B

1

C

`xy+yz +zx`

D

None of these

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The correct Answer is:
A
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LUCENT PUBLICATION-ALGEBRAIC IDENTITIES -Exercise - 1A
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