1.

\[\int_{{}}^{{}}{\frac{\tan x}{\sec x+\tan x}\ dx=}\]

A.            \[\sec x+\tan x-x+c\]
B.            \[\sec x-\tan x+x+c\]
C.            \[\sec x+\tan x+x+c\]
D.            \[-\sec x-\tan x+x+c\]
Answer» C.            \[\sec x+\tan x+x+c\]


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