$-1 < x, y < 1$ માટે, જો $\int \frac{x}{\sqrt{1+x}+\sqrt{1-x}} dx + \int \frac{y}{\sqrt{y+1}+\sqrt{y-1}} dy = A(1+x)^{3/2} + B(1-x)^{3/2} + f(y)(y+1)^{3/2} + g(y)(y-1)^{3/2} + C$ હોય, તો $A f(y) + B g(y) =$

  • A
    $\frac{2y}{15}$
  • B
    $\frac{-4}{45}$
  • C
    $\frac{-8}{15}$
  • D
    $\frac{3y+2}{45}$

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