\begin{array} { l } { \text { Prove that: } } \\ { \text { (i) } \quad – InterviewSolution

1.	\begin{array} { l } { \text { Prove that: } } \\ { \text { (i) } \quad \cos 20 ^ { \circ } + \cos 100 ^ { \circ } + \cos 140 ^ { \circ } = 0 } \end{array}
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