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) 1

B

2) 0

C

3) tan(x-y)tan(y-z)tan(z-x)

D

4) tan(y-x)tan(z-y)tan(x-z)

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