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  1. If cosA + cos²A = 1, then the value of (sin²A + sin4A) is :
    1. 1
      2
    2. 1
      4
    3. 1
      3
    4. 1
Correct Option: D

cosA + cos²A = 1
⇒ cosA = 1 – cos²A = sin²A
∴ sin²A + sin4A
= sin²A + (sin²A)²
= sin²A + cos²A = 1


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