यदि $a^{2} > b^{2}$ है,तो $f(x) = a^{2} \cos^{2} x + b^{2} \sin^{2} x$ का न्यूनतम मान ज्ञात कीजिए।

  • A
    $a^{2} - b^{2}$
  • B
    $b^{2}$
  • C
    $a^{2} + b^{2}$
  • D
    $a^{2}$

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