यदि $\cos ^3 x \sin 4 x = \sum_{r=0}^{n} a_{r} \sin rx$ सभी $x \in R$ के लिए है,तो $a_3+a_5 : a_1+a_7 = $

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

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यदि $\tan \theta + \tan \left(\theta + \frac{\pi}{3}\right) + \tan \left(\theta + \frac{2\pi}{3}\right) = 3$ है,तो निम्नलिखित में से कौन सा $1$ के बराबर है?

यदि $630^{\circ} < \theta < 810^{\circ}$ और $\tan \theta = -\frac{7}{24}$ है,तो $\cos \left(\frac{\theta}{4}\right) = $

यदि $\cos A = \frac{3}{4}$ है,तो $32 \sin \left(\frac{A}{2}\right) \sin \left(\frac{5A}{2}\right) = $

$\cos 15^\circ = $

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