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Category: Integration

find-dx-1-cosx-cos-2x-

Question Number 64818 by mathmax by abdo last updated on 22/Jul/19 finddx1+cosx+cos(2x) Commented by mathmax by abdo last updated on 22/Jul/19 $${let}\:{I}\:=\int\:\frac{{dx}}{\mathrm{1}+{cosx}\:+{cos}\left(\mathrm{2}{x}\right)}\:\Rightarrow\:{I}\:=\int\:\frac{{dx}}{\mathrm{1}+{cosx}+\mathrm{2}{cos}^{\mathrm{2}} {x}−\mathrm{1}}…