\operatorname { tan } 20 ^ { \circ } \operatorname { tan } 40 ^ { \cir – InterviewSolution

1.	\operatorname { tan } 20 ^ { \circ } \operatorname { tan } 40 ^ { \circ } \operatorname { tan } 60 ^ { \circ } \operatorname { tan } 80 ^ { \circ } = 3
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