यदि $y = (\cos^{-1} x)^2$ है,तो $(1-x^2) y_2 + p x y_1 + q = 0$ है। $p+q$ का मान ज्ञात कीजिए।

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

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यदि $y = a \cos (\ln x) + b \sin (\ln x)$ है,तो $x^2 \frac{d^2y}{dx^2} + x \frac{dy}{dx}$ का मान ज्ञात कीजिए।

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