tan 10° tan 15° tan 75° tan 80° = ?
Consider tan 10° tan 15° tan 75° tan 80°
= tan 10° tan 80° tan 15° tan 75°
= tan 10° tan (90 – 10)° tan 15° tan (90 – 15)°
= (tan 10° cot 10°) (tan 15° cot 15°)
= (1) × (1) = 1
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Couldn't generate an explanation.
Generated by AI. May contain inaccuracies — always verify with your textbook.
