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Multiplying and dividing by sec x + tan x helps find the antiderivative of sec x. Which is it?
Asec x + tan x + C
Bln|cos x + sin x| + C
Cln|sec x − tan x| + C
Dln|sec x + tan x| + C
Answer & Solution
Correct answer: D. ln|sec x + tan x| + C
Multiplying and dividing by (sec x + tan x) gives the form du/u with u = sec x + tan x.
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