\left.\begin{array}{l}{ \operatorname { cot } ( \frac { A } { 2 } ) + \operatorname { cot } ( \frac { B } { 2 } ) + \operatorname { cot } ( \frac { C } { 2 } ) }\\{ = \operatorname { cot } ( \frac { A } { 2 } ) \cdot \operatorname { cot } ( \frac { B } { 2 } ) \cdot \operatorname { cot } ( \frac { C } { 2 } ) }\end{array} \right.

\left.\begin{array}{l}{ \operatorname { cot } ( \frac { A } { 2 } ) +

1.	\left.\begin{array}{l}{ \operatorname { cot } ( \frac { A } { 2 } ) + \operatorname { cot } ( \frac { B } { 2 } ) + \operatorname { cot } ( \frac { C } { 2 } ) }\\{ = \operatorname { cot } ( \frac { A } { 2 } ) \cdot \operatorname { cot } ( \frac { B } { 2 } ) \cdot \operatorname { cot } ( \frac { C } { 2 } ) }\end{array} \right.
Answer» bhag Teri to