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$\int {{\rm{cose}}{{\rm{c}}^4}x\,dx} = $

• A
  $\cot x + \frac{{{{\cot }^3}x}}{3} + c$
• B
  $\tan x + \frac{{{{\tan }^3}x}}{3} + c$
• ✓
  $ - \cot x - \frac{{{{\cot }^3}x}}{3} + c$
• D
  $ - \tan x - \frac{{{{\tan }^3}x}}{3} + c$