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The standard result for integrating sec x involves which expression?
Aln|sec x - tan x| + C
Bln|tan x + 1| + C
Ctan x + sec x + C
Dln|sec x + tan x| + C
Answer & Solution
Correct answer: D. ln|sec x + tan x| + C
Multiplying by (sec x + tan x)/(sec x + tan x) and substituting t = sec x + tan x gives ln|t|.
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