If int(cos 4x+1)/(cotx-tanx)dx=a cos 4x+...

If `int(cos 4x+1)/(cotx-tanx)dx=a cos 4x+c,` then `a=`

A

`k=-1//2`

B

`k=-1//8`

C

`k=-1//4`

D

None of these

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The correct Answer is:

B

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