यदि $\frac{2 \tan(x)}{1-\tan^2(x)}$ का मान धनात्मक है,तो $x$ के वे मान ज्ञात कीजिए जिनके लिए $x \in \left(0, \frac{\pi}{2}\right)$ है।

  • A
    $\left(0, \frac{\pi}{3}\right)$
  • B
    $\left(0, \frac{\pi}{6}\right)$
  • C
    $\left(0, \frac{\pi}{4}\right)$
  • D
    $\left(0, \frac{\pi}{8}\right)$

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यदि $\frac{5\pi}{2} < x < 3\pi$ है,तो व्यंजक $\frac{\sqrt{1 - \sin x} + \sqrt{1 + \sin x}}{\sqrt{1 - \sin x} - \sqrt{1 + \sin x}}$ का मान क्या है?

$\sin 20^\circ \sin 40^\circ \sin 60^\circ \sin 80^\circ = $

$(1+\sec 2\theta)(1+\sec 4\theta) = $

$\tan A + 2 \tan 2A + 4 \tan 4A + 8 \cot 8A = $

यदि $\frac{\sec 8\theta - 1}{\sec 4\theta - 1} = \frac{a + b \tan^2 2\theta}{1 + c \tan^2 2\theta + d \tan^4 2\theta}$ (जहाँ $\theta \neq \frac{n\pi}{16}, n \in I$),तो $(a - b + c - d)$ का मान ज्ञात कीजिए।

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