1.

int (dx)/(cos(x + 4) cos (x + 2)) is equal to

Answer»

`(1)/(SIN 2) LOG |cos (x + 4)^(2)| + C`
`(1)/(2) log |(sec (x + 2))/(sec (x + 4))| + C`
`(1)/(sin 2) log |(sec (x + 4))/(sec (x + 2))| + C`
`log |(sec (x + 4))/(sec (x + 2))| + C`

Answer :c


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