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

  • A
    $67 \frac{1}{2}^{\circ}$
  • B
    $75^{\circ}$
  • C
    $22 \frac{1}{2}^{\circ}$
  • D
    $15^{\circ}$

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$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] = $

यदि $\frac{\cos (\theta_1+\theta_2)}{\cos (\theta_1-\theta_2)}+\frac{\cos (\theta_3-\theta_4)}{\cos (\theta_3+\theta_4)}=0$ है,तो $\cot \theta_1 \cdot \cot \theta_2 \cdot \cot \theta_3 \cdot \cot \theta_4=$

$\cos 52^\circ + \cos 68^\circ + \cos 172^\circ$ का मान है

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

यदि $\sin \alpha - \cos \alpha = m$ और $\sin 2 \alpha = n - m^2$,जहाँ $-\sqrt{2} \leq m \leq \sqrt{2}$ है,तो $n$ का मान ज्ञात कीजिए।

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