यदि $\int \frac{\sin 2 x}{(a+b \cos x)^{2}} d x=\alpha\left[\log _{e}|a+b \cos x|+\frac{a}{a+b \cos x}\right]+c$ है, तो $\alpha=$

  • A
    $\frac{2}{b^{2}}$
  • B
    $\frac{2}{a^{2}}$
  • C
    $-\frac{2}{b^{2}}$
  • D
    $-\frac{2}{a^{2}}$

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