यदि $a \sin \theta = b \cos \theta$,जहाँ $a, b \neq 0$,तो $a \cos 2 \theta + b \sin 2 \theta = $

  • A
    $ab$
  • B
    $a$
  • C
    $b$
  • D
    $\frac{a}{b}$

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Similar Questions

$\sin 20^\circ \sin 40^\circ \sin 60^\circ \sin 80^\circ = $

$\sqrt{2+\sqrt{2+\sqrt{2+2 \cos 8 \theta}}} = $

यदि $\tan \alpha = \frac{-12}{5}$,$\cot \beta = \frac{7}{24}$,$\alpha$ दूसरे चतुर्थांश में नहीं है और $\beta$ पहले चतुर्थांश में नहीं है,तो $\sqrt{13} \sin \frac{\alpha}{2} + \cos \frac{\beta}{2} + \tan \frac{\alpha}{2} \cot \frac{\beta}{2} = $

$\cos 15^\circ = $

मान ज्ञात कीजिए: $\cos \frac{\pi}{5} \cos \frac{2\pi}{5} \cos \frac{4\pi}{5} \cos \frac{8\pi}{5}$

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