[عکس: https://test.occupationalhealth.ir/uc/96/96105.JPG]
الف) ln|sec x + tan x| + c
ب) ln|sec x| + c
ج) ln|tan x| + c
د) sec x tan x + c

[عکس: https://test.occupationalhealth.ir/uc/96/9610596.JPG]