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+1 vote
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in Mathematics by (66.1k points)

Show that tan 48° tan 23° tan 42° tan 67° = 1

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LHS = tan 48° tan 23°tan 42°tan 67°

= Cot (90°-48°) cot (90°-23°) tan 42° tan 67° 

= Cot 42° cot 67° tan 42° tan 67° 

=1

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