int{1+tanx*tan(x+A)}dx=cotA*ln|f(x)|+C ...

`int{1+tanxtan(x+A)}dx=cotAln|f(x)|+C` then f(x) equal to

A

`(sex(x+A))/(secx)`

B

`(cosec(x+A))/(cosec(x-A))`

C

`(cosec(x-A))/(cosecx)`

D

`(sec(x-A))/(secx)`

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