જો $\frac{\cos A}{3} = \frac{\cos B}{4} = \frac{1}{5}$, $-\frac{\pi}{2} < A < 0$, અને $-\frac{\pi}{2} < B < 0$ હોય, તો $2 \sin A + 4 \sin B$ ની કિંમત શોધો.

  • A
    $4$
  • B
    $-2$
  • C
    $-4$
  • D
    $0$

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જો $\tan \theta = \frac{\sin \alpha - \cos \alpha}{\sin \alpha + \cos \alpha}$ હોય,તો $\sin \alpha + \cos \alpha$ અને $\sin \alpha - \cos \alpha$ ની કિંમત શું થાય?

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જો $\tan \theta = - \frac{1}{\sqrt{10}}$ અને $\theta$ ચોથા ચરણમાં હોય,તો $\cos \theta = $

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