यदि $\cos ^{2} x+\cos ^{4} x=1$ है,तो $\tan ^{2} x+\tan ^{4} x=?$

  • A
    $0$
  • B
    $1$
  • C
    $2 \tan ^{2} x$
  • D
    $2 \tan ^{4} x$

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