$\int \frac{\sec ^2 x}{\sin ^7 x} d x - \int \frac{7}{\sin ^7 x} d x =$

  • A
    $\frac{1}{\sin ^6 x \cos x} + c$
  • B
    $\frac{\tan x}{\sin ^8 x} + c$
  • C
    $\sin ^8 x \cos x + c$
  • D
    $\sec x \tan ^7 x + c$

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