यदि $\sin \theta = -\frac{3}{4}$ है,तो $\sin 2 \theta = $

  • A
    $\frac{3 \sqrt{7}}{8}$
  • B
    $-\frac{3 \sqrt{7}}{8}$
  • C
    $\frac{2 \sqrt{3}}{7}$
  • D
    $-\frac{2 \sqrt{3}}{7}$

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यदि $\tan \left(\frac{x}{2}\right) = \frac{m}{n}$ है,तो $m \sin (x) + n \cos (x)$ का मान किसके बराबर है?

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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।

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