\cos 60 ^ { \circ } = \frac { 1 - \tan ^ { 2 } 30 ^ { \circ } } { 1 + – InterviewSolution

1.	\cos 60 ^ { \circ } = \frac { 1 - \tan ^ { 2 } 30 ^ { \circ } } { 1 + \tan ^ { 2 } 30 ^ { \circ } }
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