यदि $\cos 2B = \frac{\cos(A+C)}{\cos(A-C)}$ है,तो $\tan A, \tan B, \tan C$ किसमें हैं?

  • A
    गुणोत्तर श्रेणी (Geometric Progression).
  • B
    समांतर श्रेणी (Arithmetic Progression).
  • C
    हरात्मक श्रेणी (Harmonic Progression).
  • D
    अरिथमेटिको-जियोमेट्रिक श्रेणी.

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