यदि $\left(\frac{\sin 3 \theta}{\sin \theta}\right)^2-\left(\frac{\cos 3 \theta}{\cos \theta}\right)^2=a \cos b \theta$ है,तो $a: b=$

  • A
    $4: 1$
  • B
    $8: 1$
  • C
    $3: 2$
  • D
    $2: 1$

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

यदि $\frac{\cos ^2 48^{\circ}-\sin ^2 12^{\circ}}{\sin ^2 24^{\circ}-\sin ^2 6^{\circ}}=\frac{\alpha+\beta \sqrt{5}}{2}$, जहाँ $\alpha, \beta \in N$, तो $\alpha+\beta$ का मान . . . . . . है।

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

यदि $\cot \frac{2x}{3} + \tan \frac{x}{3} = \operatorname{cosec} \frac{kx}{3}$ है, तो $k$ का मान है

सिद्ध कीजिए कि: $\cos 4x = 1 - 8 \sin^2 x \cos^2 x$

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