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

  • A
    $2$
  • B
    $1$
  • C
    $1\frac{2}{3}$
  • D
    $1\frac{1}{2}$

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