1.

int(dx)/(cosx-sinx)=...+c

Answer»

`(1)/(sqrt(2))LOG|tan((x)/(2)+(PI)/(8))|`
`(1)/(sqrt(2))log|tan((x)/(8)+(x)/(2))|`
`(1)/(sqrt(2))log|tan((x)/(2)-(3PI)/(8))|`
`log|"cos"(x)/(2)|`

Answer :A


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