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  1. The value of tan 10° tan 15° tan 75° tan 80° is
    1. 0
    2. 1
    3. - 1
    4. 2
Correct Option: B

tan10°.tan15°. tan75° . tan80°
= (tan10°. tan80°)(tan15°.tan75°)
= (tan10°. cot10°)(tan15°.cot15°)
= 1 × 1 = 1
[tan(90° – θ) = cotθ; tanθ . cotθ = 1]


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