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[" 26."int(1-tan x)/(1+tan x)dx=],[" 1) ...

[" 26."int(1-tan x)/(1+tan x)dx=],[" 1) "log|1+tan x|+c],[" 2) "log|1-tan x|+c],[" 3) "log|sin x+cos x|+c],[" 4) "log|sin x-cos x|+c]

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