यदि $\cos(\theta - \alpha) = a$ और $\sin(\theta - \beta) = b$ है, तो $\cos^2(\alpha - \beta) + 2ab \sin(\alpha - \beta) + \cos^2(\theta - \alpha)$ का मान क्या होगा?

  • A
    $a^2 + b^2$
  • B
    $a^2 - b^2$
  • C
    $b^2 - a^2$
  • D
    $a^2 + 2b^2$

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मान ज्ञात कीजिए: $(\cos 252^{\circ} - \sin 126^{\circ})(\cos 252^{\circ} + \sin 126^{\circ})(\sin^2 126^{\circ} + \sin^2 186^{\circ} + \sin^2 66^{\circ})$

$\sin\,10^o \sin\,30^o \sin\,50^o \sin\,70^o$ का मान है

यदि $A$ तीसरे चतुर्थांश में स्थित है और $3 \tan A - 4 = 0$ है,तो $5 \sin 2A + 3 \sin A + 4 \cos A$ का मान ज्ञात कीजिए।

$\operatorname{cosec} 48^{\circ}+\operatorname{cosec} 96^{\circ}+\operatorname{cosec} 192^{\circ}+\operatorname{cosec} 384^{\circ} = $

यदि $\sin 2\theta + \sin 2\phi = \frac{1}{2}$ और $\cos 2\theta + \cos 2\phi = \frac{3}{2}$ है,तो $\cos^2(\theta - \phi) =$

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