$0 \leq x \leq \frac{\pi}{4}$ के लिए समीकरण $32^{\tan^{2} x} + 32^{\sec^{2} x} = 81$ के हलों की संख्या क्या है?

  • A
    $3$
  • B
    $1$
  • C
    $0$
  • D
    $2$

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

$\sin \frac{2 \pi}{5}+\sin \frac{4 \pi}{5}+\sin \frac{6 \pi}{5}+\sin \frac{8 \pi}{5}$ का मान ज्ञात कीजिए।

यदि $\theta \in \left(\frac{\pi}{2}, \frac{3 \pi}{2}\right)$ है,तो $\sqrt{4 \cos^{4} \theta + \sin^{2} 2 \theta} + 4 \cot \theta \cos^{2} \left(\frac{\pi}{4} - \frac{\theta}{2}\right)$ का मान ज्ञात कीजिए।

यदि $\cos \alpha = \operatorname{sech} \beta$ है,तो $\beta =$

$\frac{e^{4x} + e^{-4x} + 14}{4(e^x - e^{-x})^2} = \dots$

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