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  1. The simple value of tan 1°. tan 2°. tan 3°....... tan 89° is
    1. 1
      2
    2. 0
    3. 1
    4. 2
      3
Correct Option: C

tan 1° . tan 2° . tan 3° ... tan 89°
= (tan 1° . tan 89°) (tan 2°. tan88°) ... tan 45°
= (tan 1°. tan(90° – 1°) ) (tan 2° tan (90° – 2°) .. tan 45°
= (tan 1° . cot 1°) (tan 2°. cot 2°) .. tan 45°
= 1.1..1. = 1
[tan (90° – θ) = cot θ]



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