Show that: tan48° tan23° tan 42° tan67°=1
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tan48 tan(90-48)tan42 tan(90-42)=1
tan48 cot 48 tan 42 cot 42=1
1/cot48 cot48 1/cot42 cot42=1
1=1
tan48 cot 48 tan 42 cot 42=1
1/cot48 cot48 1/cot42 cot42=1
1=1
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