Show that:-
Tan48°tan23°tan42°tan67°=1
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Step-by-step explanation:
LHS=(Tan48.Tan42) . (Tan23.Tan67)
=(Tan48.Tan(90-48)) . (Tan23.Tan(90-23))
=(Tan48.Cot48) . (Tan23.Cot23)
=(Tan48. 1/Tan48) . (Tan23. 1/Tan23)
=(1) . (1)
= 1 =RHS
LHS=RHS
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