$\int \frac{x(x \sin x+\cos x)^{-2}}{\sec x} d x=$ . . . . . . $+C$

  • A
    $\frac{-1}{\sin x+x \cos x}$
  • B
    $\frac{-1}{x \sin x+\cos x}$
  • C
    $\frac{x}{x \sin x+\cos x}$
  • D
    $\frac{1}{\sin x+x \cos x}$

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