27.∫(1+tan⁡x)(1−tan⁡x)dx27. \int \frac{(1 + \tan x)}{(1 - \tan x)} dx

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27.∫(1+tan⁡x)(1−tan⁡x)dx27. \int \frac{(1 + \tan x)}{(1 - \tan x)} dx

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