Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of sum and difference of two and three angles
Easy$1 - 2{\sin ^2}\left( {\frac{\pi }{4} + \theta } \right) = $
- A$\cos 2\theta $
- B$ - \cos 2\theta $
- C$\sin 2\theta $
- D$ - \sin 2\theta $
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