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  1. The value of (tan35° tan45° tan55°) is
    1. 1
      2
    2. 2
    3. 0
    4. 1
Correct Option: D

tan 35° . tan 45° . tan 55°
= tan 35° . 1 . tan (90° – 35°)
= tan 35° . 1 . cot 35° = 1.1 = 1
[tan (90° – θ) = cot θ ; tan θ . cot θ = 1]


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