सभी संभावित त्रिकों $(a_1, a_2, a_3)$ की संख्या ज्ञात कीजिए ताकि सभी $x$ के लिए $a_1 + a_2 \cos 2x + a_3 \sin^2 x = 0$ हो।

  • A
    $0$
  • B
    $1$
  • C
    $3$
  • D
    अनंत

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