જો $\sin \theta + \sin^2 \theta = 1$ હોય,તો $\cos^2 \theta + \cos^4 \theta = \dots$

  • A
    $1$
  • B
    $\cos^2 \theta \cdot \sin^2 \theta$
  • C
    $2$
  • D
    $1 + \cos^2 \theta$

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