In\[\Delta \,ABC\],\[({{b}^{2}}-{{c}^{2}})\cot A+({{c}^{2}}-{{a}^{2}})\cot B+({{a}^{2}}-{{b}^{2}})\cot C=\]

\[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}\]

\[2\,({{a}^{2}}+{{b}^{2}}+{{c}^{2}})\]

In\[\Delta \,ABC\],\[({{b}^{2}}-{{c}^{2}})\cot A+({{c}^{2}}-{{a}^{2}})

1.	In\[\Delta \,ABC\],\[({{b}^{2}}-{{c}^{2}})\cot A+({{c}^{2}}-{{a}^{2}})\cot B+({{a}^{2}}-{{b}^{2}})\cot C=\]
A.	0
B.	\[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}\]
C.	\[2\,({{a}^{2}}+{{b}^{2}}+{{c}^{2}})\]
D.	\[\frac{1}{2abc}\]
Answer» B. \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}\]

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In\[\Delta \,ABC\],\[({{b}^{2}}-{{c}^{2}})\cot A+({{c}^{2}}-{{a}^{2}})\cot B+({{a}^{2}}-{{b}^{2}})\cot C=\]

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