\left. \begin{array} { l } { \operatorname { cos } 2 A + \operatorname – InterviewSolution

1.	\left. \begin{array} { l } { \operatorname { cos } 2 A + \operatorname { cos } 2 B + \operatorname { cos } 2 C } \\ { = - 1 - 4 \cdot \operatorname { cos } A \cdot \operatorname { cos } B \cdot \operatorname { cos } C } \end{array} \right.
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