\operatorname { tan } A = \frac { 1 } { 7 } \text { and } \operatornam – InterviewSolution

1.	\operatorname { tan } A = \frac { 1 } { 7 } \text { and } \operatorname { tan } B = \frac { 1 } { 3 } , \text { show that cos } 2 A = \operatorname { sin } 4 B
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