$0 \leq x \leq \frac{\pi}{4}$ 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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$\cos 13^{\circ} \sin 17^{\circ} \sin 21^{\circ} \cos 47^{\circ} = $

$\frac{1}{\sin 1^{\circ} \sin 2^{\circ}}+\frac{1}{\sin 2^{\circ} \sin 3^{\circ}}+\frac{1}{\sin 3^{\circ} \sin 4^{\circ}}+\ldots+\frac{1}{\sin 89^{\circ} \sin 90^{\circ}} = ?$

$\cot 16^{\circ} \cot 44^{\circ} + \cot 44^{\circ} \cot 76^{\circ} - \cot 76^{\circ} \cot 16^{\circ} = $

$\tan 81^{\circ}-\tan 63^{\circ}-\tan 27^{\circ}+\tan 9^{\circ}$ का मान ज्ञात कीजिए।

यदि $0 \leq x \leq 3$ और $0 \leq y \leq 3$ है,तो समीकरण $\left(\sqrt{\sin^2 x - \sin x + \frac{1}{2}}\right) 2^{\sec^2 y} = 1$ के हलों $(x, y)$ की संख्या क्या है?

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