show that tan48° tan16° tan42° tan74°=1
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tan48 tan16 tan42 tan74
tan48 tan42 tan16 tan74
tan48 tan( 90° - 48) tan16 tan ( 90 - 16)
tan48 cot48 tan16 cot16
cotA tanA = 1
1 × 1 = 1 Prooved
tan48 tan42 tan16 tan74
tan48 tan( 90° - 48) tan16 tan ( 90 - 16)
tan48 cot48 tan16 cot16
cotA tanA = 1
1 × 1 = 1 Prooved
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