$2\cos^2 \theta - 2\sin^2 \theta = 1$,तो $\theta = \dots \dots ^\circ$

  • A
    $15$
  • B
    $30$
  • C
    $45$
  • D
    $60$

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यदि $\cos (\alpha + \beta ) = \frac{4}{5}, \sin (\alpha - \beta ) = \frac{5}{13}$ और $\alpha, \beta$ का मान $0$ और $\frac{\pi}{4}$ के बीच है,तो $\tan 2\alpha = $

$3\,\left[ {{{\sin }^4}\,\left( {\frac{{3\pi }}{2} - \alpha } \right) + {{\sin }^4}\,(3\pi + \alpha )} \right] - 2\,\left[ {{{\sin }^6}\,\left( {\frac{\pi }{2} + \alpha } \right) + {{\sin }^6}(5\pi - \alpha )} \right] = $

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$\frac{{\sqrt 2 - \sin \alpha - \cos \alpha }}{{\sin \alpha - \cos \alpha }} = $

यदि $\sin \theta = - \frac{1}{\sqrt{2}}$ और $\tan \theta = 1$ है,तो $\theta$ किस चतुर्थांश में स्थित है?

$2(\sin^6 \theta + \cos^6 \theta) - 3(\sin^4 \theta + \cos^4 \theta) + 1$ का मान ज्ञात कीजिए।

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