$k \in N, \int \frac{1-k \cos ^2 x}{\sin ^k x \cdot \cos ^2 x} d x=$

  • A
    $\frac{\tan x}{\sin ^{k+x}}+C$
  • B
    $\frac{\tan x}{\sin ^k x}+C$
  • C
    $\sin ^k x \sec ^2 x+C$
  • D
    $k \sin ^{k-1} x \cos x+C$

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