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int(x+5)/(x^(2)+4x+5)dx=alog(x^(2)+4x+5)...

`int(x+5)/(x^(2)+4x+5)dx=alog(x^(2)+4x+5)+btan^(-1)(x+k)+C`, then (a,b,k) equals

A

`((1)/(2),3,2)`

B

`((1)/(2),1,2)`

C

`((1)/(2),3,1)`

D

(1,3,2)

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