1.

int(dx)/(sinx+cosx) is equal to

Answer»

`log tan(PI//4)+X//8)+C`
`sqrt(2) log tan (x//2+pi//8)+C`
`(1)/(sqrt(2))log |tan((x)/(2)+(pi)/(8))|+C`
`sqrt(2)log tan ((x)/(4)-(pi)/(8))+ C`

ANSWER :C


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