1.

int (1)/(7 + 5 cos x )dx =

Answer»

`(1)/(sqrt(5)) tan^(-1)( (1)/(sqrt(3)) tan ""(X)/(2) ) + c `
`(1)/(sqrt(6)) tan^(-1) ((1)/(sqrt(6)) tan"" (x)/(2) ) + c `
`(1)/(sqrt(7)) tan^(-1)(tan""(x)/(2)) + c `
`(1)/(sqrt(4)) tan^(-1) (tan ""(x)/(2)) + c `

ANSWER :B


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