Show that tan 48 tan 16° - tan 42 tan 74 =1.
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Tan 48 tan 16 tan 42 tan 74=1
LHS = cot(90-48). tan 16. tan 42 . cot(90-74)
= cot 42. tan 16. tan 42 . tan 16
= cot 42. tan 42. cot 16 . tan 16
= 1× 1
= 1
LHS=RHS
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