\[{{\cot }^{-1}}\frac{xy+1}{x-y}+{{\cot }^{-1}}\frac{yz+1}{y-z}+{{\cot }^{-1}}\frac{zx+1}{z-x}=\]

\[{{\cot }^{-1}}x+{{\cot }^{-1}}y+{{\cot }^{-1}}z\]

\[{{\cot }^{-1}}\frac{xy+1}{x-y}+{{\cot }^{-1}}\frac{yz+1}{y-z}+{{\cot

1.	\[{{\cot }^{-1}}\frac{xy+1}{x-y}+{{\cot }^{-1}}\frac{yz+1}{y-z}+{{\cot }^{-1}}\frac{zx+1}{z-x}=\]
A.	0
B.	1
C.	\[{{\cot }^{-1}}x+{{\cot }^{-1}}y+{{\cot }^{-1}}z\]
D.	None of these
Answer» B. 1

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\[{{\cot }^{-1}}\frac{xy+1}{x-y}+{{\cot }^{-1}}\frac{yz+1}{y-z}+{{\cot }^{-1}}\frac{zx+1}{z-x}=\]

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