1.

int (dx)/(cos(x+4)cos(x+2))=

Answer»

`(1)/(SIN2)LOG|cos(x+4)^2|+c`
`(1)/(2)log|(sec(x+2))/(sec (x+4))|+c`
`(1)/(sin2)log|(sec(x+4))/(sec(x+2))|+c`
`log|(sec(x+4))/(sec(x+2))+c|`

Answer :C


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