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$\int f (x) dx = ?$

\ln |\tan (\frac{π}{4} - \frac{x}{2})| + c

l n |\tan (\frac{π}{4} + \frac{x}{2})| + c

l n |\sec x - t a n x| + c

\ln |\tan x - s e c x| + c

ANS : 2

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