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

  • A
    $A.P.$
  • B
    $G.P.$
  • C
    $H.P.$
  • D
    इनमें से कोई नहीं

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यदि $\sin \theta + \cos \theta = 1$ है,तो $\sin \theta \cos \theta = $

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यदि $\sin \theta + \sin^2 \theta = 1$ है,तो $\cos^2 \theta + \cos^4 \theta$ का मान क्या होगा?

$\left( {1 + \cos \frac{\pi }{8}} \right)\,\left( {1 + \cos \frac{{3\pi }}{8}} \right)\,\left( {1 + \cos \frac{{5\pi }}{8}} \right)\,\left( {1 + \cos \frac{{7\pi }}{8}} \right) = $

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