यदि $\left| a\sin^2 \theta + b\sin \theta \cos \theta + c\cos^2 \theta - \frac{1}{2}(a + c) \right| \le \frac{1}{2}k$ है,तो $k^2$ का मान ज्ञात कीजिए।

  • A
    $b^2 + (a - c)^2$
  • B
    $a^2 + (b - c)^2$
  • C
    $c^2 + (a - b)^2$
  • D
    इनमें से कोई नहीं

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