જો $\tan A = n \tan B$ અને $\sin A = m \sin B$ હોય,તો $\cos ^{2} A$ ની કિંમત શોધો.

  • A
    $\frac{m^{2}-1}{n^{2}-1}$
  • B
    $\frac{m^{2}+1}{n^{2}+1}$
  • C
    $\frac{m^{2}+1}{n^{2}-1}$
  • D
    $\frac{m^{2}-1}{n^{2}+1}$

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જો $\tan \theta = \frac{x \sin \phi}{1 - x \cos \phi}$ અને $\tan \phi = \frac{y \sin \theta}{1 - y \cos \theta}$ હોય,તો $\frac{x}{y} = $

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$\sin 780^{\circ} \sin 480^{\circ} + \cos 240^{\circ} \cos 300^{\circ}$ નું મૂલ્ય શોધો.

જો $\tan A = \frac{1}{2}$ અને $\tan B = \frac{1}{3}$ હોય,તો $A + B$ ની કિંમત શોધો.

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