A) \[\cos 2\theta \]
B) \[-\cos 2\theta \]
C) \[\sin 2\theta \]
D) \[-\sin 2\theta \]
Correct Answer: D
Solution :
\[1-2{{\sin }^{2}}\left( \frac{\pi }{4}+\theta \right)=\cos \left( \frac{\pi }{2}+2\theta \right)=-\sin 2\theta \].
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