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  1. The value of cot 10° . cot 20° . cot 60° . cot 70° . cot 80° is
    1. 1
    2. -1
    3. √3
    4. 1
      √3
Correct Option: D

cot10°.cot 80°. cot20°. cot70°. cot 60° = cot10°.tan10° . cot 20°. tan 20°. cot 60°

= 1 × 1 ×
1
√3


=
1
√3


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