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  1. If sin θ + sin²θ = 1 then cos²θ + cos4θ is equal to
    1. None
    2. 1
    3. sin θ
      cos² θ
    4. cos² θ
      sin θ
Correct Option: B

sinθ + sin²θ = 1
⇒ sinθ = 1 – sin²θ = cos2θ
∴ cos²θ + cos4θ
= cos²θ + (cos²θ)²
= cos²θ + sin²θ = 1


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