यदि $\alpha, \beta$ न्यून कोण इस प्रकार हैं कि $\sin \beta=2 \sin \alpha$ और $3 \cos \beta=2 \cos \alpha$,तो $\sec (\alpha+\beta)=$

  • A
    $4$
  • B
    $\sqrt{15}$
  • C
    $\sqrt{20}$
  • D
    $5$

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Similar Questions

मान लीजिए $E = \left( 1 - \frac{\cos 61^\circ}{\cos 1^\circ} \right) \left( 1 - \frac{\cos 62^\circ}{\cos 2^\circ} \right) \dots \left( 1 - \frac{\cos 119^\circ}{\cos 59^\circ} \right)$,तो $E$ का मान ज्ञात कीजिए।

श्रेणी $\cos 12^{\circ} + \cos 84^{\circ} + \cos 132^{\circ} + \cos 156^{\circ}$ का मान है

व्यंजक $\cos^2 \alpha + \cos^2(\alpha + 120^\circ) + \cos^2(\alpha - 120^\circ)$ का मान ज्ञात कीजिए।

$\frac{\sin 1^{\circ}+\sin 2^{\circ}+\ldots+\sin 89^{\circ}}{2(\cos 1^{\circ}+\cos 2^{\circ}+\ldots+\cos 44^{\circ})+1} = $

यदि $\operatorname{Sinh}^{-1} x = \operatorname{Cosh}^{-1} y = \log(1+\sqrt{2})$ है, तो $\operatorname{Tan}^{-1}(x+y) = $

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