\operatorname { tan } ( x - y ) + \operatorname { tan } ( y - z ) + \o – InterviewSolution

1.	\operatorname { tan } ( x - y ) + \operatorname { tan } ( y - z ) + \operatorname { tan } ( z - x ) = \operatorname { tan } ( x - y ) \operatorname { tan } ( y - z ) \operatorname { tan } ( z - x )
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