यदि $A, B, C, D$ एक चक्रीय चतुर्भुज के कोण हैं,तो $\cos A + \cos B + \cos C + \cos D = $

  • A
    $2(\cos A + \cos C)$
  • B
    $2(\cos A + \cos B)$
  • C
    $2(\cos A + \cos D)$
  • D
    $0$

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मान लीजिए $A = \{ \theta : 2\cos^2 \theta + \sin \theta \le 2 \}$ और $B = \{ \theta : \frac{\pi}{2} \le \theta \le \frac{3\pi}{2} \}$,तो $A \cap B$ है

एक धनात्मक पूर्णांक $n$ के लिए,मान लीजिए ${f_n}(\theta ) = \left( {\tan \frac{\theta }{2}} \right)\,(1 + \sec \theta )\,(1 + \sec 2\theta )\,(1 + \sec 4\theta ) \dots (1 + \sec {2^n}\theta ).$ तो

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$\sin (\pi + \theta )\sin (\pi - \theta )\csc^2 \theta = $

यदि $x=a(\sin \theta+\cos \theta)$ और $y=b(\sin \theta-\cos \theta)$ है,तो $\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}$ का मान ज्ञात कीजिए।

यदि $\sin \alpha = -\frac{3}{5},$ जहाँ $\pi < \alpha < \frac{3\pi}{2}$ है,तो $\cos \frac{\alpha}{2} = $

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