$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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यदि $\cot \alpha = 1$ और $\sec \beta = -\frac{5}{3}$,जहाँ $\pi < \alpha < \frac{3\pi}{2}$ और $\frac{\pi}{2} < \beta < \pi$ है,तो $\tan(\alpha + \beta)$ का मान और वह चतुर्थांश जिसमें $\alpha + \beta$ स्थित है,क्रमशः हैं

सिद्ध कीजिए कि $\sin^{2} 6x - \sin^{2} 4x = \sin 2x \sin 10x$.

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