1.

2. Show that:(i) tan 48° tan 23° tan 42° tan 67"-1

Answer»

tan48° tan23° tan42° tan67°=tan48° tan23° tan(90°-48°) tan(90°-23°)=tan48° tan23° cot48° cot 23°=(tan48° cot48°)(tan23° cot23°)=1×1=1

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