tan 5 degree×tan 30 degree×4 tan 85 degree is equal to
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an 5 × tan 30 × 4 tan 85
tan 5 × tan 30 × 4 × tan 85
tan ( 90 - 85) × tan 30 × tan 85
cot 85 × tan 30 × tan 8
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We know, 5
tan 30 = 1/√3
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cot 85 × 1/√3 × tan85
1 × 1/√3
1/√3
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