If x,y,z are any three real numbers, the...

If x,y,z are any three real numbers, then ` tan (x-y) + tan (y-z) + tan (z-x)` is equal to

A

1

B

0

C

`tan (x-y) tan (y-z) tan (z-x)`

D

`tan (y-x) tan (z-y) tan (z-x)` is equal to

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The correct Answer is:

C

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