Find the value of tan 15 tan 20 tan 70 tan 75
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Note: tan Φ = cot (90 - Φ)
= tan 15 × tan 20 × cot (90 - 70) × cot (90 - 75)
= tan 15 × tan 20 × cot 20 × cot 15
= 1 × 1
= 1
= tan 15 × tan 20 × cot (90 - 70) × cot (90 - 75)
= tan 15 × tan 20 × cot 20 × cot 15
= 1 × 1
= 1
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