જો $x^2+y^2=1$ હોય,તો નીચેનામાંથી કયું સાચું છે?

  • A
    $y y^{\prime \prime}-\left(2 y^{\prime}\right)^2+1=0$
  • B
    $y y^{\prime \prime}+\left(y^{\prime}\right)^2+1=0$
  • C
    $y y^{\prime \prime}-\left(y^{\prime}\right)^2-1=0$
  • D
    $y y^{\prime \prime}+\left(2 y^{\prime}\right)^2+1=0$

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જો $a x^2+2 h x y+b y^2=0$ હોય,તો $\frac{d^2 y}{d x^2}=$

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