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If I=int(dx)/(a+b cosx), where a,bgt0 an...

If `I=int(dx)/(a+b cosx)`, where `a,bgt0` and `a+b=u, a-b=v`, then
`I=1/sqrt(uv)ln|(sqrtu+sqrtv tanx/2)/(sqrtu-sqrtv tanx/2)|+c` when?

A

`v=0`

B

`v<0`

C

`v>0`

D

none

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