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1. $8 \sin^{4} \frac{θ}{2} - 8 \sin^{2} \frac{θ}{2} + 1$

A. $2 \sin^{2} θ$
B. $2 \sin^{2} θ$
C. $2 \sin^{2} θ$
D. $2 \sin^{2} θ$

Answer: Option D

Explanation:

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