यदि $\alpha = \sin 36^{\circ}$ है,तो $\alpha$ निम्नलिखित में से किस समीकरण का मूल है?

  • A
    $10 x^{4}-10 x^{2}-5=0$
  • B
    $16 x^{4}+20 x^{2}-5=0$
  • C
    $16 x^{4}-20 x^{2}+5=0$
  • D
    $16 x^{4}-10 x^{2}+5=0$

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यदि $\tan x = \frac{3}{4}$ और $\pi < x < \frac{3 \pi}{2}$ है,तो $\cos \frac{x}{2} = . . . . . .$

सिद्ध कीजिए कि $\frac{\sin x - \sin 3x}{\sin^2 x - \cos^2 x} = 2 \sin x$.

$\tan \left(\frac{7 \pi}{8}\right)$ का मान है

$\cos \frac{\pi}{2^2} \cdot \cos \frac{\pi}{2^3} \cdot \cos \frac{\pi}{2^4} \cdots \cos \frac{\pi}{2^{10}} = $

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

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