यदि $\frac{d}{d x}\left(\frac{x^2}{(x+2)(2 x+3)}\right)=\frac{A}{(x+2)^2}+\frac{B}{(2 x+3)^2}$ है,तो $A+B=$

  • A
    $1 / 2$
  • B
    $-5$
  • C
    $-3 / 2$
  • D
    $9 / 4$

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$\int \frac{dx}{\sin x + \sin 2x} = $

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