In any triangle ABC, \[a\cot A+b\cot B+c\cot C=\]

1.	In any triangle ABC, \[a\cot A+b\cot B+c\cot C=\]
A.	\[r+R\]
B.	\[r-R\]
C.	\[2(r+R)\]
D.	\[2(r-R)\]
Answer» D. \[2(r-R)\]

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In any triangle ABC, \[a\cot A+b\cot B+c\cot C=\]

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