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Verified answer
Integral Fungsi Trigonometri.∫ sec x dx
= ∫ sec x (sec x + tan x) / (sec x + tan x) dx
= ∫ (sec x tan x + sec² x) / (sec x + tan x) dx
u = tan x + sec x
du / dx = sec² x + sec x tan x
= ∫ 1 / u du
= ㏑ u + C
= ㏑ |tan x + sec x| + C