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1) tan 48° tan 23° tan 42° tan 67° = 1
2) cos 38° cos 52° - sim 38° sim 52° = 0
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1.LHS= tan 48°tan23°tan42°tan67°
=tan48°tan42°tan23°tan67°
=tan48°tan(90-48)°tan23°tan(90-23)°
=tan48°cot48°tan23°cot23°
=1x1
=1
=RHS
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