cos-4-x-sin-4-x-cos2x-1-dx-

Question Number 64801 by mmkkmm000m last updated on 21/Jul/19

$$\int\left({cos}^{\mathrm{4}} {x}+{sin}^{\mathrm{4}} {x}\right)/\left({cos}\mathrm{2}{x}+\mathrm{1}\right){dx} \\ $$