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

  • A
    $4a^2b^2$
  • B
    $a^2 - b^2$
  • C
    $a^2 + b^2$
  • D
    $-a^2b^2$

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यदि $\alpha$ और $\beta$,$\sin^2 x + a \sin x + b = 0$ तथा $\cos^2 x + c \cos x + d = 0$ के हल हैं,तो $\sin(\alpha + \beta)$ का मान क्या होगा?

$\frac{\cot 54^\circ}{\tan 36^\circ} + \frac{\tan 20^\circ}{\cot 70^\circ}$ का मान है

यदि $x = \sec \theta + \tan \theta$ है,तो $x + \frac{1}{x} = $

यदि $\sqrt x + \frac{1}{{\sqrt x }} = 2\cos \theta$ है,तो ${x^6} + {x^{ - 6}} = $

$\frac{{\sin 3\theta - \cos 3\theta }}{{\sin \theta + \cos \theta }} + 1 = $

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