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  1. If sin A + sin²A =1 then what is the value of cos²A + cos4A ?
    1. 1
      2
    2. 1
    3. 2
    4. 3
Correct Option: B

sin A + sin²A = 1
⇒ sin A = 1 – sin²A = cos²A
∴ cos4A = sin²A
∴ cos²A + cos4A
= cos²A + sin²A = 1


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