tan 48° tan 23° tan 42° tan 67° = 1
Consider L.H.S.
= tan 48° tan 23° tan 42° tan 67°
= tan 48° tan 42° tan 23° tan 67°
= tan 48° tan (90-48)° tan 23° tan (90-23)°
= (tan 48° cot 48°) (tan 23° cot 23°)
= (1) × (1) = 1 = R.H.S
Hence, proved.
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Generated by AI. May contain inaccuracies — always verify with your textbook.
