यदि $A = \sin^2 x + \cos^4 x$ है,तो सभी वास्तविक $x$ के लिए :

  • A
    $1 \le A \le 2$
  • B
    $\frac{13}{16} \le A \le 1$
  • C
    $\frac{3}{4} \le A \le 1$
  • D
    $\frac{3}{4} \le A \le \frac{13}{16}$

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