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  1. Find the value of 1 – 2 sin²θ + sin4θ.
    1. sin4θ
    2. cos4θ
    3. cosec4θ
    4. sec4θ
Correct Option: B

1 – 2 sin²θ + sin4 θ
= (1 – sin²θ)² = (cos²θ)² = cos4θ


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