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