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  1. The value of cos 1° cos 2° cos 3°....... cos 177° cos 178° cos 179° is :
    1. 0
    2. 1
      2
    3. 1
    4. 1
      √2
Correct Option: A

cos 90° = 0
∴ cos 1°. cos 2° ... cos 179° = 0


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