If In = int cot^n xdx then (cot^(n - 1)...

If `I_n = int cot^n xdx ` then `(cot^(n - 1))/(n - 1)` equals

A

`I_n + I_(n - 2)`

B

`-(I_n + I_(n - 2))`

C

`I_n - I_(n - 2)`

D

`- I_n + I_(n - 1) (n ge 4)`

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