मान ज्ञात कीजिए: $\cos^2 A(3 - 4\cos^2 A)^2 + \sin^2 A(3 - 4\sin^2 A)^2$

  • A
    $\cos 4A$
  • B
    $\sin 4A$
  • C
    $1$
  • D
    इनमें से कोई नहीं

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सिद्ध कीजिए कि $\tan 3x \tan 2x \tan x = \tan 3x - \tan 2x - \tan x$.

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