12tan2x−14tan4x+c\frac{1}{2} \tan ^{2} x-\frac{1}{4} \tan ^{4} x+c21tan2x−41tan4x+c
ln∣tanx∣+tan2x+c\ln |\tan x|+\tan ^{2} x+cln∣tanx∣+tan2x+c
ln∣tanx∣+12tanx+c\ln |\tan x|+\frac{1}{2} \tan x+cln∣tanx∣+21tanx+c
ln∣tanx∣+12tan2x+c\ln |\tan x|+\frac{1}{2} \tan ^{2} x+cln∣tanx∣+21tan2x+c