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  1. The value of cos²20° + cos²70° is:
    1. 0
    2. 1
    3. 1
      2
    4. 1
      √3
Correct Option: B

cos²20° + cos²70°
= cos²20° + cos²(90° – 20°)
= cos²20° + sin²20° = 1
[∵ cos (90° – θ) = sin θ]


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