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If y=1/(a-z), " then " (dz)/(dy) is...

If `y=1/(a-z), " then " (dz)/(dy)` is

A

`(a-z)^(2)`

B

`-(z-a)^(2)`

C

`(z+a)^(2)`

D

`-(z+a)^(2)`

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