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\frac { \operatorname { cos } 10 ^ { \circ } + \operatorname { sin } 10 ^ { \circ } } { \operatorname { cos } 10 ^ { \circ } - \operatorname { sin } 10 ^ { \circ } } = \operatorname { tan } k ^ { \circ } , \text { then } k =

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