यदि $\tan A = n \tan B$ और $\sin A = m \sin B$ है,तो $\cos ^{2} A$ का मान क्या होगा?

  • 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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