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

sinA + sin2A
⇒  sinA = 1 – sin2A = cos2A
∴  cos2A + cos4A
= cos2A + (cos2A)2
= cos2A + sin2A


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